What about those that are just visitors to the UK?
Nothing wrong with helping the traveller looking to sample the local talent while passing through.
And how do you know who is a true visitor?
Any "tourist" popping up on this board will be able to read and research like the rest of us before asking. There is no soft landing for those who blunder around with "I want..."
Approach with humility and there're several kinder souls here to ease noobs in with just the right amount of KY.