Here is a list of 20 well-regarded Thai restaurants in London (2023):

1. Som Saa
2. Smoking Goat
3. Kiln
4. The Begging Bowl
5. Rosa’s Thai Cafe
6. The Heron
7. The Thai Room
8. The Churchill Arms
9. Thai Square
10. Mango Tree
11. Busaba Eathai
12. Patara
13. Rosa’s Thai Cafe
14. Rosa’s Thai Cafe
15. The Mango Tree
16. The Noodle House
17. The Greyhound
18. Thep Thai
19. Sukho Thai
20. Patara Fine Thai Cuisine

Please note that restaurant rankings and availability may have changed since my last update, so it’s always a good idea to check recent reviews and ratings to ensure the current quality and status of these establishments.