G-AZLT was a series 813 not an 802 It was powered by Dart R Da 7's & was purchased by BMA from South African Airways in 1972.
The series 802 was built for BEA & were considerably less powerful.
I believe the accident referred to actually occured in 1980. The CAA registration database appears to confirm this as it shows the first registration date for G-BMAT as 30th March 1981