I was on the BA 207 to Miami on G-XLEF on Friday. We all started boarding and were waiting on the jetty when we were told the temperature on the aircraft was 27 degrees and rising so it was not safe to board and they were sourcing an air conditioning unit.

We were offloaded and then had to board again picking up a delay of over 2 hours

BA knew the APU was U/S on G-XLEF but did not check the temperature during the morning and it was only the Captain arriving that caused some action to kick in.

There were many missed connections necessitating overnight hotel stays in Miami and lots of rerouting onto other carriers so this must have cost BA a fortune all for the sake of having a member of staff monitor the temperature during the morning plus lots of unhappy passengers.