Originally Posted by
WHBM
Yes, I think Heathrow House (still there) had worked through a few tenants, including BA, as I recall a continuing problem with telephone crossed lines with a BA back office elsewhere (in passing an aspect of telecoms that has gone completely away). The company took over the whole building some time in the late 1970s, and moved out 10 years later. The building had a substantial "refacing" of the glazed front A4 elevation, including much more rigorous double glazing. Phone number 01-759-6522 I recall (which appears thus to have been circulating uselessly in my brain these last 35 years ...).
759 being derived from SKYport on the old rotary dialling telephones. British Eagle's telephone number was SKYport 3611, BOAC's was SKYport 5511 as late as April 1969, but by October 1972 it had changed to 01-759-5511.