He is very handsom! This is so sad, I am sorry you have to get rid of him.
You can neuter males, but it is done very early on, it's called caponizing. I would not recommend doing it or if you wanted to try you would need a qualitdfied avian vet that has all the equipment and anesthesia necessary and even then there is no guarantee he would not crow although it may reduce the frequency.
The is a thread you could search for here on BYC started by a US vet asking if there was a market for de-crowing roosters. There was a description where he did surgery making slits in the syrinx (voice box) and the air was shunted into the air sacs instead of through the voie box and the sound was greatly decreased. You would have to find an avian vet that has been trained in this surgery aim England.
Your best bet is to find him a home. You can post an ad here on BYC in the buy/sell section. I rehomed 3 cockerels this last fall by placing an ad on Craigslist. Not sure if you have that over there, but I am sure there must be online ad services that are similar. When I placed my ad I got lots of calls from folks that sounded like they wanted dinner or other uses. I waited patiently and a ldy called and took all three. She wanted roosters for her flock so she could raise chicks for self-sufficiency plus as flock protectors from coyotes and foxes.
Good luck, on the plus side he is really beautiful do it might be easier to rehomed him.