Well for a scouser to not make a spelling mistake you're probably already in the top 5% lol! Seriously, good luck to ya and I hope your experience next week turns out well, Tom might even decide you're better than his regular 'boy'!
For longer term gas experience you may have to work for nothing with a gas fitter, thats what I did for 6 months. Write a nice letter (with no spelling mistakes) highlighting what you've done and the investment you've made in yourself and then copy it many times. Send these all off to as many gas fitters as you can find on the net or Yellow Pages. If you feel confident, ring a few up and outline your plans and ask whether they need a helper to get your portfolio. Plan roughly what you're gonna say before you ring as u don't want to start spluttering and hesitating on the phone.You'll get a lotof NO's but you might just get a YES, I did. If they think you can contribute with your plumbing skills they may just be prepared to spend some time with you showing you whats what. Good luck!