I'd be amazed if B&Q stocked it. You could try Mackey's as they are far more likely to have it (along with many other types of tape which may be suitable).
If not I may have a roll around somewhere left over from the work in the attic.
Good call; Mackays did indeed have some. Not yet sure whether they had enough (it comes in tiny 3m rolls); I'll find that out when I try using it this evening. Thanks!
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If not I may have a roll around somewhere left over from the work in the attic.