Live 8 handed table at local casino.
Hero is 200bb deep
Villain covers

EDIT: I have been playing the table for about 2 hours and villain is young man who looks the part of a good player and I have not seen him get out of line at all.

Hero dealt Ah 10h in middle position with one limper before him.

Hero raises to £6
Villain calls out of small blind
Limper calls

Flop - 10c 7c 3d

Villain bets £6
Limper calls
Hero raises to £22
Villain calls
Limper folds

Turn - 3h

Villain checks
Hero checks

River - 8d

Villain bets £48

What do I do?

I hope I set this out so that people understand the action. Any feedback greatly appreciated.