I bought some red coloured/backed double sided from e-Bay seller: atomic7 for £2.99. incl. postage. It works fine if you put it on the underside edges of the LCD. It is fiddly and you need tweezers to apply, but it does work and keeps the LCD screen well in place.
I purchased my NEX-5 replacement screen from e-Bay 'buy it now' from seller: szdigital2013. It came from China and cost a mere £10.29 inc.post.
Thank you, Emily. I had to discount the instrucion: "turn the LCD screen fully upwards" (or words to that effect) since my NEX-5 doesn't allow for this - it opens in two stages. Stage 1 = 73 deg. from vertical, (so you look down at the screen) Stage 2 = only allows the LCD to pivot downwards to about 48 deg. from the Vertical, (so you look up at the screen). In turn this means fairly difficult access to those tiny screws inside. It didn't function first time so I parted the ribbon connector again and applied some Maplin Contact Cleaner - then it did work (I rebuild Laptops). Applying the two-sided sticky tape was also very fiddly - needing three hands really, but eventually all was well. These are all Very Small Points. in the main, though, I wouldn't have known where to start without your extremely detailed pictures. So thanks again! Michael at Studio1.