Ah thanks so much for the great response and to Nigel, sounds like Direct Tyres are going to be the right guys. My plan tomorrow is to go to halfords/motorworld buy a new locking nut set then to direct tyres wallasey for some new tyres (rock ferry sold out) then to rock ferry for them to remove and fit new ones!!

Hope it goes to plan otherwise I'm screwed!

not the time of year to be driving with bald tyres,, hope you get it sorted lol

Is it an original Vauxhall locking key?

If so, take it to the dealer and get them to match it up. Most dealers carry a full set of locking nut keys (Ive had to do this with Nissan and BMW), so they bring a case full of key to the car, try each one until they find one that fits, and then sell it to you (Last one I got was from BMW and it cost £7), and then relace it for themselves for stock in the future.

....of course, it wouldnt surprise me if Vauxhall didnt do this - something that makes so much sense, yet they are oblivious

Failing that, take it to a garage and get it removed - wont cost much, and should damage the wheels....