Hmmm; have you tried silvered or black duct tape ?
Alternatively you can get aluminium foil tape and I can safely say that its completely opaque to light - used lots of it when dealing with the insulation in ejde's attic.
Aluminium foil tape sounds like just the thing. Is that something I should be able to get easily in B&Q or similar? I might pop out there at lunchtime if so.
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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Alternatively you can get aluminium foil tape and I can safely say that its completely opaque to light - used lots of it when dealing with the insulation in
If not I may have a roll around somewhere left over from the work in the attic.