Blood tests after Hep B are routine in the UK (although vaccinations for this are not routinely carried out - you have to ask specially for it here). Even after a course of vaccinations, you still may not have developed immunity (although A + B are given seperately here, so not sure how much this will apply). One of my colleagues cannot get Hep B to "stick", while another needed two more injections.
Hep A will provide 6 weeks of protection if the course is not completed. 10 years if course completed.