No Vaccinations are compulsory in the UK. There is enough scientific evidence now that immunity from the core diseases, last far longer than 3yrs. Dr Shultz is the leading world authority on immunology having carried out scientific research since the 1970's.
The link below is very lengthy ( you will need two cups of coffee and a few biscuits and a paper and pen to take notes) But well worth viewing, in particular the end where he is asked what he does with his own dogs
http://www.youtube.com/watch?v=L1Xd5ghnlJ4There is now a cheaper in house in-house titre system called Vaccicheck, the vet can take a small sample of blood from the ear. Each kit cost approx. £12 but vets have to buy a box of 12.
It can be obtained from the following veterinary supplier :-
Woodley Equipment Company Ltd.
Old Station Park Buildings,
St John Street Bolton, Lancashire. BL6 7NY
Tel :- 01204 669033
www.sales@woodleyequipment.co.
I understand that some branches of Companion Care Vets ( Inside Pets at Home) are now offering Vaccicheck at a cost of approx. £35 per dog.
The lepto vaccine is the one that carries the most risk of adverse reaction when given alone, I will pop up some other links, but I am not sure how to copy more than one at a time.