Was in Hobbycraft the other day and they are selling roughly A4 size sheets of Duct tape  (209 x 254mm vs A4 size of 210 ? 297mm) at a pound a pop in various colours.  Not seen these before, but I guess someone will say they've been out for years!  https://www.hobbycraft.co.uk/black-duck-tape-sheet-209cm-x-254cm/632466-1000  Suppose it could be useful for large scale patching, e.g. holes in space ships, iceberg dent in your ocean liner etc.  Picked up a few just in case...

Blue Peter had sticky back plastic years ago ,nowt new under the sun !