if you're still worried Pav - and I can see why you don't really trust what the vet said - sounds like a case of 'well, she would say that, wouldn't she?' - you could try contacting the vaccine manufacturer direct, and see what they say - the name of the vaccine will be in Mr Jangles's vaccination record card, and Google should give you contact details
but only to set your mind at rest - I'm sure Souffle is right