Ben, I asked simtech a while ago ( about a month) about the A320 and they said it wasnt theres to hire, so obviously its EI's and simtech manage it, so you wont be able to hire it for practice. I'd try some of the other places in London, I recently asked virtual aviation and a few others, I found CTC to be the best deal. But yes the A320 is at simtech.
I have applied to EI also but no word yet, I'm low houred, but honestly mate I'm not that bothered whether they call me or not, as I got another job last week with BMI, so very happy.
the very best of luck to you, let me know how you get on.
Tony
PS the guy I belive to speak to is Mike at CTC, I've never been there but I had my email communication with a girl called Jo.