January 2023 Update.
The complete list of current two-seat Spitfires.
Airworthy
1. MT818 Airworthy operated by Biggin Hill Heritage Hangar
2. MJ627 Airworthy operated by Biggin Hill Heritage Hangar
3. MJ772 Airworthy now lives at the Royal Netherlands Historic Flight foundation.
4. ML407 Airworthy operated by Ultimate Warbird Flights
5. PV202 Airworthy operated by Aerial Collective
6. TE308 Airworthy operated by Biggin Hill Heritage Hangar
7. PT462 Airworthy operated by Aerial Collective
8. MH367 Airworthy operated by Warbird Adventure Rides
9. SM520 Airworthy operated by Spitfires.com
10. NH341 Airworthy operated by Aero Legends
11. ML295 Airworthy restored at Biggin Hill Heritage Hangar
12. BS410 Owned by Martin Philips. Operated by @Spitfire
Non airworthy
13. EN570 Being restored for Norwegian Flying Aces
14. MJ444 Being restored for Aero Legends
15. BS548 Being restored by Aircraft Restoration Company for Ross Pay.
16. TE566 Being restored by Airframe Assemblies Ltd for Enstone.
17. A T9 being restored for Aerial Collective at ARCo.
There are at least three other aircraft that are proposed but until they get off of the drawing board then I'll leave them off of the public list.