Hi Tiggy's mum,
Personally if it was my cat I would feel it was covered if the titre levels were high enough.
HOWEVER our local council's interpretation of the Animal Boarding Establishment Act 1963 (they use the Environmental Health Officers (EHO) recommendations) requires all cats to be fully vaccinated for cat flu and enteritis i.e. completed initial or restarted course and done yearly, if we do not check and confirm this we are in breach of our license and can lose it and thus our livelihood. Each local authority can interpret the Animal Boarding Establishment Act 1963 as it sees fit and not all apply the EHO recommendations. thus causing confusion when trading on the boundary between different councils. In addition our insurance requires all cats and rabbits to be vaccinated otherwise it is null and void as well.
Insurance polices like our licenses appear to just state rules to abide by, with no leaway for problems. I know there is much debate about how often dogs and cats should / need to be vaccinated, but until they do proper research over a long period of time 10-15 years by vaccinating cats in different ways (initial course, initial course plus first booster, initial course plus 2 years of boosters etc and checking titre levels over 10-15years, we probably will not get a difinative answer. In addition, the only ones probably able to do this kind of research in sufficient numbers is probably the vaccine manufacturers and it is not in their interest to reduce the need to vaccinate!!!
I hope this is of assistance