They are a not for profit organisation, and everyone who works there has been on one of the programmes so they know exactly what you are going through! Another good thing is that they will help you set up a bank account in England (something which can otherwise be quite difficult). In fact, I think it might be worth mentioning that they usually, from what I remember, send people to the Natwest on Holborn Circus, so even if you're not with BUNAC, and you're looking to set up a bank account, that branch should know what they're doing.