Clearly post-1970 as Brindley House is seen standing astride the canal, alongside 95 Newhall Street which was Midlands Telecommunications HQ. The dark-faced floor below the MTRHQ tower housed what was claimed to be the 'largest open-plan office in Europe' at the time. Unfortunately the unions didn't like the idea so it ended up housing spare office equipment and a small group called Management Services, i.e. producing simple charts for senior managers!