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In page B. K. S. Iyengar:

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In 1967, the Inner London Education Authority (ILEA) called for classes in "Hatha Yoga", free of yoga philosophy, but including asanas and "pranayamas (sic)" suitable especially for people aged over 40. The ILEA's Peter McIntosh watched some of Iyengar's classes, was impressed by Light on Yoga, and from 1970 ILEA-approved yoga teacher training in London was run by one of Iyengar's pupils, Silva Mehta. Iyengar was careful to comply with the proscription of yoga philosophy, and encouraged students to follow their own religious traditions, rather than trying to follow his own family's Visistadvaita, a qualified non-dualism within Hinduism.[10][11]