Successful B2B MAN just now on the delayed BA1372/BA1373 in quest to fly on EUPJ (which didn't work out despite booking 2hrs prior STD!)
Many thanks to ianwall's earlier post from October as well as KARFA's. Still using bus gates, and still opening the rear left door on the bus. Marathon of a run to gate A5 after fast track security (empty).
On block time to walking through the aircraft door again was 32 minutes.
Not sure I'd recommend Manchester for a B2B - but at least in my situation the train back to London was an option if it went wrong.