There are still £5 coffee+cake deals in coastal Norfolk if you know where to go (some local cyclists publish maps or at least stop names), and some places around here are famous for "Chelsea-on-sea" prices. Mostly "rijo" coffee which isn't bad, but of course it doesn't support the local roasters.
There was one tourist-aimed pub in Thetford Forest that redid all its internal brickwork with smooth white render and hiked its prices up so drink+cake was over £10. That was about a decade ago and it's still boycotted by at least two cycling groups.