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Could some nice person lend me one of these please.

sign85

Isn't it Torx that you require and not Allen?
I believe that the size you want is probably T-15 which is a common size and will be in most Torx drive kits including in kits that can be bought in the pound shop.

Aldi have been selling sets of Allen and Torx keys at a very reasonable price for the last couple of weeks may be worth a look