diff --git a/global_defs.scad b/global_defs.scad
index c07b381..5d57ec9 100644
--- a/global_defs.scad
+++ b/global_defs.scad
@@ -51,7 +51,7 @@ $fa = 6;
 $fs = extrusion_width / 2;
 
 function round_to_layer(z) = ceil(z / layer_height) * layer_height;
-// Some additional named colors
+// Some additional named colours
 grey20                          = [0.2, 0.2, 0.2];
 grey30                          = [0.3, 0.3, 0.3];
 grey40                          = [0.4, 0.4, 0.4];
diff --git a/readme.md b/readme.md
index 22dc598..398c584 100644
--- a/readme.md
+++ b/readme.md
@@ -1905,7 +1905,7 @@ PCBs and perfboard with optional components. The shape can be a rectangle with o
 | Module | Description |
 |:--- |:--- |
 | ```barrel_jack(cutout = false)``` | Draw barrel power jack |
-| ```buzzer(height, diameter, colour)``` | Draw PCB buzzer with specified height, diameter and color |
+| ```buzzer(height, diameter, colour)``` | Draw PCB buzzer with specified height, diameter and colour |
 | ```chip(length, width, thickness, colour, cutout = false)``` | Draw a coloured cube to represent a chip, or other rectangular component |
 | ```flat_flex(cutout = false)``` | Draw flat flexistrip connector as used on RPI0 |
 | ```flex(cutout = false)``` | Draw flexistrip connector |
@@ -1991,7 +1991,7 @@ PCBs and perfboard with optional components. The shape can be a rectangle with o
 | Module | Description |
 |:--- |:--- |
 | ```barrel_jack(cutout = false)``` | Draw barrel power jack |
-| ```buzzer(height, diameter, colour)``` | Draw PCB buzzer with specified height, diameter and color |
+| ```buzzer(height, diameter, colour)``` | Draw PCB buzzer with specified height, diameter and colour |
 | ```chip(length, width, thickness, colour, cutout = false)``` | Draw a coloured cube to represent a chip, or other rectangular component |
 | ```flat_flex(cutout = false)``` | Draw flat flexistrip connector as used on RPI0 |
 | ```flex(cutout = false)``` | Draw flexistrip connector |
@@ -2749,7 +2749,7 @@ The "Soft" parameter can be used to determinesif the sheet material needs machin
 * If soft, wood screws will be used, with a pilot hole.
 * If not soft, either tapped holes or a clearance hole and nuts will be used to retain screws.
 
-The "Color" parameter is a quad-array: [R, G, B, Alpha], or can be a named color, see [OpenSCAD_User_Manual](https://en.wikibooks.org/wiki/OpenSCAD_User_Manual/The_OpenSCAD_Language#color).
+The "Colour" parameter is a quad-array: [R, G, B, Alpha], or can be a named colour, see [OpenSCAD_User_Manual](https://en.wikibooks.org/wiki/OpenSCAD_User_Manual/The_OpenSCAD_Language#color).
 
 For speed sheets should be modelled in 2D by subtracting holes from 2D templates made by ```sheet_2D()``` and then extruded to 3D with ```render_2D_sheet()```.
 Note that modules that drill holes will return a 2D object if ```h``` is set to 0 to facilitate this.
@@ -2771,8 +2771,8 @@ Note that modules that drill holes will return a 2D object if ```h``` is set to
 ### Modules
 | Module | Description |
 |:--- |:--- |
-| ```render_2D_sheet(type, color = false)``` | Extrude a 2D sheet template and give it the correct colour |
-| ```render_sheet(type, color = false)``` | Render a sheet in the correct colour after holes have been subtracted |
+| ```render_2D_sheet(type, colour = false)``` | Extrude a 2D sheet template and give it the correct colour |
+| ```render_sheet(type, colour = false)``` | Render a sheet in the correct colour after holes have been subtracted |
 | ```sheet(type, w, d, corners = [0, 0, 0, 0])``` | Draw specified sheet |
 | ```sheet_2D(type, w, d, corners = [0, 0, 0, 0])``` | 2D sheet template with specified size and optionally rounded corners |
 
@@ -3492,7 +3492,7 @@ Just a BOM entry at the moment and cable bundle size functions for holes, plus c
 | ```cable_tie_holes(cable_r, h = 100)``` | Holes to thread a ziptie through a panel to make a cable tie. |
 | ```mouse_hole(cable, h = 100, teardrop = false)``` | A mouse hole to allow a panel to go over a wire bundle. |
 | ```ribbon_cable(ways, length)``` | Add ribbon cable to the BOM |
-| ```wire(color, strands, length, strand = 0.2)``` | Add stranded wire to the BOM |
+| ```wire(colour, strands, length, strand = 0.2)``` | Add stranded wire to the BOM |
 
 ![wire](tests/png/wire.png)
 
diff --git a/vitamins/pcb.scad b/vitamins/pcb.scad
index 3150ba0..289cc84 100644
--- a/vitamins/pcb.scad
+++ b/vitamins/pcb.scad
@@ -209,7 +209,7 @@ module jack(cutout = false) { //! Draw 3.5mm jack
                 }
 }
 
-module buzzer(height, diameter, colour) { //! Draw PCB buzzer with specified height, diameter and color
+module buzzer(height, diameter, colour) { //! Draw PCB buzzer with specified height, diameter and colour
     color (colour)
         tube(or = diameter / 2, ir = height > 5 ? 1 : 0.75, h = height, center = false);
     color("white")
diff --git a/vitamins/sheet.scad b/vitamins/sheet.scad
index ae0c374..5225139 100644
--- a/vitamins/sheet.scad
+++ b/vitamins/sheet.scad
@@ -25,7 +25,7 @@
 //! * If soft, wood screws will be used, with a pilot hole.
 //! * If not soft, either tapped holes or a clearance hole and nuts will be used to retain screws.
 //!
-//! The "Color" parameter is a quad-array: [R, G, B, Alpha], or can be a named color, see [OpenSCAD_User_Manual](https://en.wikibooks.org/wiki/OpenSCAD_User_Manual/The_OpenSCAD_Language#color).
+//! The "Colour" parameter is a quad-array: [R, G, B, Alpha], or can be a named colour, see [OpenSCAD_User_Manual](https://en.wikibooks.org/wiki/OpenSCAD_User_Manual/The_OpenSCAD_Language#color).
 //!
 //! For speed sheets should be modelled in 2D by subtracting holes from 2D templates made by ```sheet_2D()``` and then extruded to 3D with ```render_2D_sheet()```.
 //! Note that modules that drill holes will return a 2D object if ```h``` is set to 0 to facilitate this.
@@ -78,11 +78,11 @@ module sheet(type, w, d, corners = [0, 0, 0, 0]) //! Draw specified sheet
     linear_extrude(sheet_thickness(type), center = true)
         sheet_2D(type, w, d, corners);
 
-module render_sheet(type, color = false) //! Render a sheet in the correct colour after holes have been subtracted
-    color(color ? color : sheet_colour(type))
+module render_sheet(type, colour = false) //! Render a sheet in the correct colour after holes have been subtracted
+    color(colour ? colour : sheet_colour(type))
         render() children();
 
-module render_2D_sheet(type, color = false) //! Extrude a 2D sheet template and give it the correct colour
-    color(color ? color : sheet_colour(type))
+module render_2D_sheet(type, colour = false) //! Extrude a 2D sheet template and give it the correct colour
+    color(colour ? colour : sheet_colour(type))
         linear_extrude(sheet_thickness(type), center = true)
             children();
diff --git a/vitamins/wire.scad b/vitamins/wire.scad
index c2b4a41..a51699e 100644
--- a/vitamins/wire.scad
+++ b/vitamins/wire.scad
@@ -23,8 +23,8 @@
 include <../utils/core/core.scad>
 include <zipties.scad>
 
-module wire(color, strands, length, strand = 0.2)   //! Add stranded wire to the BOM
-    vitamin(str(": Wire ", color, " ", strands, "/", strand, "mm strands, length ",length, "mm"));
+module wire(colour, strands, length, strand = 0.2)   //! Add stranded wire to the BOM
+    vitamin(str(": Wire ", colour, " ", strands, "/", strand, "mm strands, length ",length, "mm"));
 
 module ribbon_cable(ways, length)                   //! Add ribbon cable to the BOM
     vitamin(str(": Ribbon cable ", ways, " way ", length, "mm"));
diff --git a/vitamins/zipties.scad b/vitamins/zipties.scad
index a098987..41a10d3 100644
--- a/vitamins/zipties.scad
+++ b/vitamins/zipties.scad
@@ -17,7 +17,7 @@
 // If not, see <https://www.gnu.org/licenses/>.
 //
 
-// [width, thickness, [latch_x, latch_y, latch_z], color, tail]
+// [width, thickness, [latch_x, latch_y, latch_z], colour, tail]
 small_ziptie = ["small_ziptie", 2.5, 1.0, [4.7, 4.25, 3.0], "white", 25];
 ziptie_3mm   = ["ziptie_3mm",   3.0, 1.0, [5.4, 5.44, 4.5], "white", 25];
 ziptie_3p6mm = ["ziptie_3p6mm", 3.6, 1.2, [6.4, 6.62, 4.7], "white", 25];