KISSAIR 5000 BTU Window Air Conditioner for Small Rooms AC Unit Air Conditioner Cools Up to 150 sq.ft

Out of curiosity, are window unit A/C’s legal and available in the UK? In the US you can get a window unit A/C starting at $100. Even if you only use it 1-2 weeks a year, that’s not a high cost. https://www.walmart.com/ip/KISSAIR-5-000-BTU-115V-U-Shaped-Window-Air-Conditioner-for-Small-Room-AC-Unit-air-conditioner-Easy-Installation-Cools-up-to-150-Sq-Ft/15869322151