It's not too wet or cold in the UK. I live in the Netherland and I grow outside every year and get a decent harvest aswell. Last summer I havested 1.5kilo's dry on 5 plants.

Get some "hollands hope" seeds because of the high resisstancy agains bud rot, some good fertilized soil and get them in front of your windows untill 30 April. Then, get them outside and give them some love from time too time.

(Water the plant every time the ground is dry)