Bloomfield James Warman was an English electrical engineer. He was involved with the design of electronic telephone exchanges in the 1960s and 1970s. He was responsible for the concept of both the TXE1 and TXE3 systems, which were reed switch-based electronic exchanges. The development of these exchanges was carried out by a consortium of British telecom manufacturers in conjunction with the General Post Office. The ideas in these exchanges were later developed, by others, into the TXE4 exchanges – which, at their peak in the early 1990s, catered for more than 25% of the UK subscribers.