Has BRIT got an official slogan?
How about: BRIT coin ain't no SHIT coin!

Love it, but I have to question the "mass appeal" of it lol.

What about: "BritCoin - British Digital Currency"?
It's more professional than mine

How about this one: "Decentralized currency for the British people"
Or "Decentralized currency for the British masses", or "Decentralized currency for the British nation"?