Unregistered,
I had a similar experience with the GUM clinic here, they don't seem at all keen to offer Hep A and Hep B (booster) vaccinations. They are worth getting though and will protect you from Hep A&B from other modes of transmission which the GUM clinics don't really care about, or maybe want off their budgets. I got the impression that the GUM clinic viewed Hep A & B as only significant risks for MSMs or IDUs, which is far from the case.
lt was well worth the cost for the additional piece of mind.