
If it comes in on one of the Pet Passport routes no, but if it comes in any other port then it will need to go into Quarantine for a few days until the paperwork is sorted.
You would have to persuade the breeder to keep the pup until it was at least 10 months old (obviously you woudl have to pay for it's board), the other methiod woudl be to have it come to another country like France where a number of people are offering long term boarding to cimpkly wiht UK Pet Passport. Either way the cost are going to be similar to Quarantine.
If you wanted to shwo tyhe dog here you would have to persuade the breeder to leave the ears alone.