Ok, since no one else has said it, I will.
To Mr St. Paul's Gallery.
Interesting form of free advertising you're using here, considering you're price tag on these autographed (in pencil) prints. £750? I would think a frame would come with that. A Brian/Roger signed item goes for about £200-250, but you seem to think this print is so nice it warrants the extra £500... then you use this method to advertise. I guess that keeps the overhead pretty low.
Also, you've posted a link: paulsgallery.com, which is a parked domain. I think you meant to say "stpaulsgallery.com". Wow, now you just got me to advertise for you at no charge! Boy, you're good!
Now onto this Brian and Roger and John may show up thingy. Do you have a secret way into Brian and Roger and John that no fans have ever been able to find? I mean if you went through the proper channels, you would difinitively know if they were going to show or not. Not "may show up". Can you provide us that link? I've always wanted to personally ask Brian what kind of shampoo he uses.
Finally, most of the promotions Queen partake in, outside of self-promotion, has a charity of some sort tied to it. Are you going to give any of your amazingly huge profits (per piece) to the Terence Higgins Trust or something?
Perhaps a suggestion on what to do with your new found wealth. Since you posted this story in three-fold, you see there's a little box with a checkmark and "abc" written above. That's spellcheck. It corrects your blantant spelling errors, but does not help with grammar. Believe me, we queenzoners can attest to that!
I've found the best way to take advantage of this shamless promotional ploy is when posting your free ad, please get the words spelled right. Those were four letter words. Otherwise, people may suspect you of just trolling message boards to make a quick buck.
Best of luck,
(PS: I may or may not attend, but you can tell everyone I'll be there sometime.)