Ajarn Suchart has relocated his gym several times. The addresses at Bathurst, St.Clair, Elmsthrope, etc. are not there anymore.
The current location is 2772 Dufferin St. The gym is called House of Muay Thai (formerly known as Siam #1)
http://houseofmuaythai.com/
Ultimate Martial Arts is located at 680 Progress Ave. (416) 289-9997
http://www.ultimatethaiboxing.com/
Tiger Gym is located at 2730 Dundas West. It's a small place, located above the auto body shop.
Kombat Arts in Mississauga.
http://www.kombatarts.com/
I don't know about the status of Sun Kune Do and Lumpini locations, but I know Mafa gym is defunct, if you should come across that. There are also a few new gyms starting up, such as Scorpion in Scarborough.
Of the above, only Ultimate and Tiger gyms belong to CAMTAO, the sole organization recognized by the Ontario government as a sanctioning body for amateur muay thai fights. Pro fights are not sanctioned at this time.
This means that fighters from gyms not belonging to CAMTAO cannot fight in Ontario, and violation of this may result in criminal charges.
See
http://www.camtao.org/ for further info.
For people looking for gyms elsewhere in Ontario, there is Phady's in the Kitchener/Waterloo area:
http://www.phadymuaythai.com/
at Waterloo Regional Boxing Academy, 1253 King St. E.; Kitchener
They can direct you to gyms in Stratford, and I think Barrie.
There is also Iron Tiger in Stoney Creek:
http://www.geocities.com/irontigermuaythai/
Hope this helps.