I don't know what the scene is like in the UK, but where I am (US, but nowhere near Hollywood) it can be helpful to align yourself with an indie production company. One can expect to start out writing for credit initially, but credits can be very valuable down the road. I initially wanted to work on my own script projects, but the money I've made in that field is from co-writing-for-hire and script clean-up. Not glamorous, but it earned me contacts I can use later, and it's fun work.
It's not unusual for an indie prod. co. to get in on a co-pro with a bigger company when a big-budget project comes to town. Things can get very interesting when that happens.
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