Syed
I think for the drills you should talk to the small charter operators such as AirMed at Oxford. They might be able to fit you in one of theirs (not regularly ran mind you. Just when they need to). Because they haven't got much to get out of it (not a business), I would say you would stand better chances if you go to the office rather than over the phone.
If you meet the boss and get on well, I have little doubt about an inclination to help you (not just talking about airmed).
For the Fire course, I think it cost about £50 if you talk to Gloucester Airport Fire Crew (Ask for Ron)