GAME is bankrupt and was a shit for a long time, WH Smith is also closing lot of stores, B&M is selling tat and is half empty. But none of these are toy stores.
Retail in the UK is very much dead, unless you need barber and vape shops.
As I said, I wouldn't call any of those three "toy shops". But all three of my local ones seem to be going strong, and sell toys or toy-adjacent things
Smyths toys is doing pretty well in my town, in an out of town centre retail park admittedly. It is situated in a fairly new retail park that got built exactly behind the old one where Toys R Us used to be. That got knocked down and replaced with warehouses. Must be cheaper to tear down and start from scratch than try to modernise after being vacant for a few years.
Town centre is lots of barbers, vape shops and betting shops. Few new independent bars and restaurants seem to be breaking through thankfully.