I'd also encourage people to make use of hp_britglish which has a good tags system, and a very large back-catalogue of questions on British tradirions specifically related to HP fanfic.
One other thing that is important to remember about British medical stuff is that the NHS is 'free at the point of service' - All Brits pay 'National Insurance' contributions (usually deducted from their pay by employers, or as part of their taxes if self-employed), and that funds the National Health Service. No doctor is ever going to ask for any further payment if you need treatment. Mostly hospitals don't even ask for your NI number - they assume that if you're British, you're entitled to treatment.
no subject
One other thing that is important to remember about British medical stuff is that the NHS is 'free at the point of service' - All Brits pay 'National Insurance' contributions (usually deducted from their pay by employers, or as part of their taxes if self-employed), and that funds the National Health Service. No doctor is ever going to ask for any further payment if you need treatment. Mostly hospitals don't even ask for your NI number - they assume that if you're British, you're entitled to treatment.