Checked in just now using the app for a LHR-MAN flight this evening but it comes up with the "there is a problem issuing your boarding pass" when I try to view the BP.
The website tells me everything is unavailable and completely ignores the "show boarding pass" box.

Can I get a BP at transfers in T5?
Flying into T3 then either getting the transfer bus or exiting and getting the tube etc.

Nothing to say it's been cancelled, but knowing BA......