In message , at 08:42:10 on Tue, 3 Apr
2018, remarked:
I saw 2 of them today doing stirling service at Waddeson manor. No sign of
any fires and easy to board with a pushchair and probably 60 people all
boarded within about 20 seconds. Who would want a bus like that eh?

Here's another spotted on Friday:

http://www.bbc.co.uk/news/uk-england-essex-43601949

Ever get the feeling maintenance was a bit slack? Also I wouldn't want to be
on an aircraft with problems at that airport if their fire trucks take so
long to turn up that the bus is virtually burnt out.

Different territory (landside vs airside); different fire trucks.
--
Roland Perry