I work in PR and regularly have to submit lists of celebrities for movie premieres. I can't guarantee you'll get an invite, but £5 is a worth a try!
Even not being a celeb, you might get lucky - you never know. These premiere companies sometimes need "filler" so there's a chance you could get an invite.
No promises here, but I think £5 is worth a gamble, and I'll write an email to a premiere list requesting you are put on the list, with a bit of blagging!