CPL holders are professionals. I wouldn't ask a plumber to work for free, why should any one expect me to fly for free in a commercial operation? If the charter mob or parachute company can charge for their services, I expect to be paid.
Yes flying is fun but try telling that to the supermarket at the checkout.
Ok, you don't have the hours. If you are single leave the UK for a while and get a job o/s. Africa hires low houred pilots. Oz and Canada do too. (However, in Oz the competition is very very tough) Sort out the immigration hassles and away you go. Life is an adventure, what an opportunity.
Don't want to leave the UK? Ok, think outside the loop. You are a pilot! Seek out parachute operations, look for interesting niche flying. I am sure there are some scenic type flights you could do in summer. If not, see if you can generate some interest. Surely 50 hours paid flying is better than nothing? Friendly with the local gliding club? Help them out with glider towing.
Just don't sit around expecting the shiny jet job to come to you.