Hi @jezzdabezz ,
The best that I could find is ~[https://www.aliexpress.com/item/32841687126.html?spm=a2g0o.productlist.0.0.29c317718Q2pSn&algo_pvid=8c345ade-584e-45f5-95ac-6f3386806e15&algo_exp_id=8c345ade-584e-45f5-95ac-6f3386806e15-2&pdp_ext_f=%7B%22sku_id%22%3A%2265192100842%22%7D&pdp_pi=-1%3B67.16%3B-1%3B-1%40salePrice%3BAUD%3Bsearch-mainSearch|36 GBP] from China.
As you said, there are no screens below 50 GBP in the UK even used tablets on Ebay want about this much or more and there usually is some problem with the screen, either a scratch or even not working. Was thinking maybe of a cheap used one as a donor parts tablet
Have found with Kindles that it is important to know the model number as they can use different screen connections even if the model name is the same but it is a subsequent “generation”. Not always but it pays to play it safe ;-)
If you do manage to find one here’s the ifixit [guide|13043] guide that may help.