AIBU to overpay my plumber

[EggbertHeartsTina]

Plumber did us a massive emergency favour a couple weeks ago and didn’t charge, and wouldn’t take money from me.

He’s just done a big (non-emergency) job for us and invoiced me accordingly. If I overpay a bit (I’m thinking £50) will it mess up his accounts / invoicing?

Thanks

Stick it in a Christmas card & give to him

That's hilarious just give him it as a tip in cash if you're that worried. Nice thought but you're over thinking it.