yes one month after first vaccination, my vet suggested a second dose after a couple of weeks to be more sure; as soon as the test results come back confirming the antibodies are there (that's why he did 2, in case so we didn't have to w8 another month), the vet will release passport.
6 months after the date of the blood test you can re-enter (mind you you can leave before that)

Then don't forget the flee/warming treatment before you re-enter the UK, that is the tricky part! It has to be done by a certified vet and between 24 and 48 hours before the authorities check his passport... not sooner nor later then that.

The blood test has also to be repeated after a certain amount of time, cannot remember already! Ask you vet to point that out; there will be not written reminders... if you forget you start the whole process again!!!!

same times same cost!