
Look up the true facts re importing a puppy into the UK. I'd suggest he will need to wait a tad longer before he's allowed in under Pet Passport. Can I, with respect, ask why you need to import from somewhere like the Czech Republic because quite honestly, unless you want his bloodlines specifically, I'd buy from a British breeder!! All too often puppies coming from that direction are puppy farmed, sickly and could be costing you a ton of money.
Apart from the DEFRA website, information below may help -
https://www.pettravel.com/immigration/czechrepublic.cfm