updated colour blocks and changed spelling from USA to UK

Author: istho

src/data/data-visualisation/colour/colour-guidance.md

@@ -68,7 +68,7 @@ The primary colour NHS Blue should be used to pull focus against NHS Grey 3.
     "blockSize": "l"})
 }}
 
-`#AEB7BD` is the hex code for NHS Grey 3 (grayish blue):  
+`#AEB7BD` is the hex code for NHS Grey 3 (greyish blue):  
 
 {{ colorBlock({
     "color": "#AEB7BD",

src/data/data-visualisation/colour/primary-colours.md

@@ -22,7 +22,7 @@ We use NHS Grey 5 as a background tint. This is because:
 - the [British Dyslexia Association's style guide][dyslexia] recommends dark text on a light, but not white, background
 - it allows different components to stand out
 
-`#F0F4F5` is the hex code for NHS Grey 5 (light grayish cyan):  
+`#F0F4F5` is the hex code for NHS Grey 5 (light greyish cyan):  
 
 {{ colorBlock({
     "color": "#F0F4F5",

src/data/data-visualisation/decluttering/decluttering.md

@@ -45,7 +45,7 @@ You can declutter by:
     "blockSize": "l"})
 }}
 
-`#AEB7BD` is the hex code for NHS Grey 3 (grayish blue):  
+`#AEB7BD` is the hex code for NHS Grey 3 (greyish blue):  
 
 {{ colorBlock({
     "color": "#AEB7BD",
@@ -69,7 +69,7 @@ You can pull focus by:
 `#AEB7BD` is the hex code for NHS Grey 3 (greyish blue):  
 
 {{ colorBlock({
-    "color": "#005EB8",
+    "color": "#AEB7BD",
     "blockSize": "l"})
 }}
 
@@ -83,7 +83,7 @@ You can pull focus by:
 `#D8DDE0` is the hex code for NHS Grey 4 (light greyish blue):  
 
 {{ colorBlock({
-    "color": "#005EB8",
+    "color": "#D8DDE0",
     "blockSize": "l"})
 }}