I believe that most of the early stuff was recorded at Mayfair studios, and that John Hudson was the engineer.
John Hudson was an ENGINEER'S engineer. If he didn't own something he built it. -I understand that he may have built the original Mayfair studios console, on which the Gary Glitter stuff was recorded.
Tape-delay-double-track on the toms, lots of 'crunch' and away you go.
The console was eventually replaced with an Amek M3000, probably around 1979 or perhaps 1980.
John and his wife ran mayfair studios, which moved at least once and I want to say twice... If you booked in there, everything was top notch, and you were treated like ROYALTY. They were also highly organised and ran the tape library which was possibly the most highly-depended-upon by the London record companies.
John is a fantastic engineer, but not very self-promoting in those terms. You might have to ask him directly, to get more detailed info.
Mayfair on the web:
http://www.mayfair-studios.co.uk/home.htmlKeith