He has been a Visiting Tutor at the Royal Northern College of Music and for over 24 years has been teaching organists at Oxford and Cambridge Universities. He also has been a Professor in Dresden, the St Petersburg Conservatory and the Royal Academy of Music in London. He also has founded the International Summer Organ Conservatoire in 1986 which is now held each year in France. Furthermore, he is the Organ Adviser to the Diocese of Coventry.
He has released several recordings of improvisations:
Allcoat Improvisations: Hommage à la France
Variations & Improvisations – CRCD 6091-92
Amazon.com lists a couple of improvisation masterclass CDs but they only seem to be available as used.
Organ Improvisation Masterclass 1
Organ Improvisation Masterclass 2
He has a stream on SoundCloud here.