It was recommended to us that we had Hep A for Turkey, then a top up 12 months later. All done now for the next 25 years apparently! (We also heard that the docs make money out of each jab they give, and the male nurse who recommended the jabs knew my husband, so maybe made a couple of quid with us having them!!!) He also recommended tetnus jabs as ours were just about out of date (lots of quids made by now!!!).
I don't think these are absolutely necessary though. Julie