Hi Helen,
Bet your so excited about your new house (apart from the ahole stress of moving, but it'll all be over soon, yay!) and the boys will be made up with the great outdoors!
Mine have access to an enclosed run (never heard of secur a cat, any web links for interest?) and just have normal flu/enteritis vaccinations.(Don't fancy the FelV myself and with them being FIV there's even the question marks over them having the normal jabs)
Saying that, one dim vet wasn't listening on one visit and Buffy was given the FelV vaccine, fortunately with no side effects.
Good luck and can't wait to see photos of the boys in their new home
x