
You will need at least 7 months bbetween now and when you intend to return to the Uk with Harvey.
Harvey would need a Rabies Innoculation ASAP, then 30 days after that he would have to have blood taken and analysed by one of a few authorised labs. If the result comes back OK with sufficient antibody titres for the Rabies then he will be able to re-enter the UK six months after the blood test.
So if you had the Rabies Vac in the morning 7th February, the earliest you could have the Blood Test would be Monday 8th March, so you couldn't bring him back into UK until after 8th September.
There are other requirements regarding timing og worming adn tick treatment before re-entry, and also the paperwork you will need. The Vet will ssort that side out. for some countries you may also have to have his other Vaccinations up to date, and may need a Heaalth Cetificate prior to travel.