Kamalashila, a teacher in the Triratna Buddhist tradition, first learned the Dharma from Urgyen Sangharakshita and was ordained in 1974. Probably because he lived in retreat for many years, at Vajraloka in Wales and as a hermit, his teaching tends to reference meditation quite a lot. You can read examples of his writing and meditation instruction here.
Not to mention…
Kamalashila‘s life and influences: Sangharakshita and the Triratna Buddhist Order.
The Essentials of meditation and more In Depth material for experienced meditators
Writing on Enlightenment and Nature, the Elements, Ecology, Death and more
Also a Blog.
There are numerous archives here of retreats materials, with the pick of the crop on the Dharma Materials resource library.
Kamalashila’s Teaching schedule is here, and you can donate and contact him here.