Freelance Television Production - Pension Advice

Hello

I am seeking a bit of advice on pensions for freelancers. I am in my mid 30s and although I have been told for years by various people to start a pension, I've never been able to find out what the best option for me is.

I work freelance as a television producer - sometimes I am on PAYE and sometimes I invoice using my Schedule D number (depending on the production company and my role/job title).

When I am on payroll at somewhere like ITV, I pay into the auto enrollment account set up (NOW pensions). But at some companies this isn't an option and even if it were, it means having 6 or 7 different pensions because I work for a number of different companies each year on 2 -3 month contracts.

If I set up a private pension of some sort (stakeholder pension? personal pension?) that I contribute to each month, which kind would be best for someone in my position? And can I get my employer to contribute to the same one?

Any advice would be much appreciated. I know there is advice on here for freelancers, but I've found it difficult to find any advice for someone with as many short contracts as we have in the television world.

Thanks

Sarah