I'd say things have been heading south for Gap UK shops for the last 10 years and accelerated recently. They have been on a downward quality path for a long time with no apparent strategy. Every time you go back, they have different ranges, so no repeat purchases are even possible. Found something you like and want to buy again? Tough. And the quality got progressively worse. For basics like jeans and t-shirts, I switched to H&M and Muji about 5 years ago. I suspect we will lose Muji soon as well though.