If you get the roast beef or similar, it is apparently traditional to discreetly tip the carver once he's served everyone. £1 or £2 should be OK.
I second, third the venison scotch egg! The roast beef for two looked great but no food envy here. The gurnard was lovely and lamb shoulder w haggis bites was delicious.
Classic diner. Roast beef is delicious. Sirloin Steak is tasty. One bad thing is no cherry pies left :(