http://www.hotbikramyoga.co.uk/home.html
I haven’t taken an actual Bikram class, but once, my regular teacher (who teaches a Iyengar/Anusara style practice), turned up the heat in her yoga studio.
The room temperature probably only got up to about 30 celsius — no where near traditional Bikram temp of 38 or higher.
However, we were all quickly sweating, and I can affirm that with the additional room heat, my muscles felt noticeable more loose and flexible.
I was able to stretch with more ease, and deeper into, a lot of poses.
I have heard that large Bikram classes, if the class has a full capacity of students, it can become quite aromatic with everyone sweating so much.
Namaste’,
dwb

“Some Like it Hot! Bikram Yoga” presented by Kris Boesch at Ignite Fort Collins 4 on 03/4/2010
Bikram Yoga, also known as Hot Yoga, is a style of yoga developed by Bikram Choudhury and a Los Angeles, California based company[1]. Bikram Yoga is ideally practiced in a room heated to 105°F (40.5°C) with a humidity of 40%. Classes are guided by specific dialogue including 26 postures and two breathing exercises. Classes last approximately 90-minutes. Beginners may take Bikram yoga classes.
The Barkan Method Hot Yoga (DVD Preview)
a film about bikram yoga, narrated by mike frayer, owner of bikram yoga in the city in chicago.
For radical rejuvenation combine Bikram yoga and the raw food diet in one lifestyle. Together, these powerful healing practices will help you to achieve an all around cleansing, healing and strengthening unmatched by any other program.