
JG,
I'd be tempted to go back to DEFRA with this. In the light of their (rather embarrassingly worded) 'Myth busted' statement they put up on their website regards the recent tabloid reporting of puppy smuggling and the risk of Rabies.
I'd use the Chingford quarantine kennel incident (when the 2 kennel hands were bitten and 1 contracted Rabies from a Sri Lankan rescue dog) as my stated case for concern. ~ I could be wrong but I'm sure I remember there was some question over the link between dog's age and vaccination.
I wonder if DEFRA are using the WSPA's research from it's street dog vaccination programmes in Brazil, Asia etc where they stated that only 70% of the population need to be vaccinated to stop Rabies.

all round.