Two of the biggest errors people make when looking for flying work is 1. send resumes only 2. don't hang around in an area that is known to take low houred pilots long enough.
So, target your area and operators. Go and see them. Be prepared to wait in the area and get to be known to them. I am very aware that there isn't much "GA" in the UK. However, there is some. The trick is to find it and position yourself to be the next person on the starting block. UK no good, then go to a country that does a lot of GA.
Use the telephone and the internet to plan your attack. Network like crazy to find the niche jobs. They are out there. It's up to you to find them.
Good luck.