Dude, if you wanna go to the actual RAW or SmackDown tapings, go to
www.ticketmaster.co.uk there's still some lower tier available, do it sharpish though.
SmackDown is also your best bet. It's not in Sheffield though; Manchester.
I've got my tickets for both, SmackDown floor seats behind the commentators, and for RAW I've got midway up the lower section. So both decent.