how do i restore colour to ipad screen and apps all are grey

Hello 087NPFT,

We're glad you thought to ask Apple Support Communities about your iPad now showing in grayscale only. Check Settings > Accessibility > Display & Text Size to see if any of these settings are turned on. Specifically check "Color Filters" as there is a grayscale option there. Here's more information: Use display and text size preferences on your iPhone, iPad, and iPod touch

Keep us posted.

Take care.

If the screen colours appear to be distorted or unnatural, you need to check some key Accessibility settings that are intended to compensate for specific colour-vision issues:

Settings > Accessibility > Display & Text Size

Ensure that all settings enclosed within the red box above are switched OFF/Disabled.