workisupnorth,
Ummm, unless you have something the airlines here really really want, then the answer is more than likely no.
There's 2 ways you can go. If you have +1500 hours in command in +30tonne aircraft in primarily international ops and the like then you can get the UK ATPL. That involves 2 exams (See Bristol Groundschool for that) and a check ride in the aircraft you have the time in. eg 737 sim etc. Note, the check MUST be done with the CAA observing. It'll cost ~ 600 pounds for the CAA alone.
Now if you are a mere mortal have time on smaller aircraft eg Bandit or Dash 8 (or FO only time in th 737) then you have to do the 14 JAR exams (see Bristol for them), and some flying.
If you have +500 hours on a JAR 25 aircraft (eg Dash 8) then find a sim, get some practice up and do the check. (Again, the CAA must observe) If your hours are made up of multi crew flying on Bandits and the like then you have the option of doing a type rating on a JAR 25 aircraft, eg Shorts 360, ATR, 737 etc and the observed check with the CAA.
The other alternative is the abridged 15 hour min IR on a Seneca and the like. You won't be issued with an ATPL, just a CPL.
Now, the CAA have all this online at their website. Look up "LASORS" and check it out. It's a minefield but you'll get the hang of it.
For JAR info, you'll have to go to the JAA website. It's much harder to navigate around.
Also, your medical can only be done at Gatwick, I think the current fee is around 200 quid in your case.