John Rumm wrote:

Probably worth highlighting the reason for Adam's indignation regarding
over sleeving. While the correct colour sleeving for a protective
conductor is the normal green/yellow, the correct colour for a
functional earth is actually cream.

Although the printing on that RCBO actually says 'PE' instead of 'FE'
for the white flylead.

and the text within the little box connected to the current transformer
and the earth flylead says "1Δ" instead of the expected "IΔ"

Original image URL (will be zoomable unless you have a portrait monitor).

https://images.squarespace-cdn.com/content/v1/5ec649c17e93ee14ea6f1a9b/1594219056973-3YJBH0HJX2Y5AZISSGW8/ke17ZwdGBToddI8pDm48kPlAdDxmOe2wO-VlVH21GUIUqsxRUqqbr1mOJYKfIPR7LoDQ9mXPOjoJoqy81S2I 8PaoYXhp6HxIwZIk7-Mi3Tsic-L2IOPH3Dwrhl-Ne3Z2KbNUfoO6AOkUKHX6DcHzYjCBx_xjkpU-kAGxUEirxz46liCGkj4dr9PBmyqqYlee/6310S.jpg

Note that MK Sentry range is now licenced for CircPro to
manufacture/sell rather than being a Honeywell brand.