Give me a Break!

[pontecagnano]

I've had this printed patch for a while now, but have had no luck in identifying it.

I believe it to be an unofficial badge of British military origin, probably a morale patch from before the term was coined, but could be wrong.

I think the graphic represents 'Give me a Break', and HTHSIK stands for 'How the hell should I know', but MCBJCS is a bit of a mystery.

Can anyone help with identification and time period please?

Many thanks for any assistance with this one.

Graham