If you are at the college, the best person to contact is your course manager. If you are at a unit, you need to contact your Fam flight co-ordinator. Look on Natsnet, one of the recent news articles covers the new scheme in place for NERL units.
When I was doing unit training I never had any problem getting fam flights however I had to show my ATC licence on all of them. If you're a trainee at the college without a licence then it may not be possible.