Follow an early thread about No 7 changing their formulations...
I have been using No 7 stay perfect foundation, shade : calico.
This has so far ticked all the boxes for me, price, coverage and most importantly, the shade.
I have very pale skin with a cool undertone and found calico to be the best match, however, since No 7 changed I no longer find it matches my skin.
Can you recommend a medium coverage foundation in the £15 or under price range. I would go into the shop but since Covid, the testers seem to have been removed.