Hi, I am originally from mediterranear area and I have seen pomegranade trees being burn by salty strong and cold wind (mistral), however they were still producing ok fruits. If you have sheltered position move it and wait. It wont take long to crop fruit!, plus extra water from UK weather is always good to swell fruits.
if you dont want give me a shout! I will buy it! Kingseed are notoriously very good! I buy vegs seeds etc and they are reliable, I dont have much experience on fruit but I would trust them more than anyone else!