On Thu, 10 Aug 2000, I wrote:
They serve to confuse the question of whether the double summer time applied was BDST or DBST; both appear in the records, so Howse's DBST needn't be a typo. On 18th April 1941, Sir Stephen Tallents of the BBC wrote to Sir Alexander Maxwell of the Home Office asking whether there was any official designation; the reply of the 21st was that there wasn't but he couldn't think of anything better than the "Double British Summer Time" that the BBC had been using informally. I've put a copy of the Home Office letter at http://student.cusu.cam.ac.uk/~jsm28/british-time/ho-19410421.png and the BBC letter may follow if I get permission from the BBC.
The BBC letter is now at: http://student.cusu.cam.ac.uk/~jsm28/british-time/bbc-19410418.png -- Joseph S. Myers jsm28@cam.ac.uk