There were three "restaurants" at London Tower when I started - two on the ground floor separated by simple partitions. One side for aircrew and highly-paid ATCOs and the other side for "manual workers". Upstairs (1st floor) was a waitress service restaurant where the 3rd floor people used to eat. We used it for going-away parties too - Alastair McLean, Bill Stretton and other musicians provided entertainment. When I left Heathrow Tower in 1993 all that lot had morphed into a machine providing Mars bars and crisps!