Escapee's quite right, in fact a lot of ntl people 'of a certain age' are either Army/RAF/Navy trained (signals, commonly) or ex-BT. Since the ex-BTers were made redundant en masse about ten-fifteen years ago they don't exactly love BT too much. These guys are among the best and longest serving though (if occasionally a little at sea with modern IT
).
Not aware of any senior management being ex-BT, I stand to be corrected though. I don't keep a scrapbook of senior ntl management