Ridership does not seem to be a problem, but reliability of the 165
fleet, whilst hitting a peak a few months ago has again slumped to
around half that achieved by the Reading based examples. ATP problems
perhaps? The Chiltern 165s do have a few extra bits on them which
would mean more to fail. The Chiltern engineering staff are looking at
some innovations which have caught the attention of other DMU
operators, all of which would go a long way to improving reliability.

I spent a few weeks at Aylesbury TMD about 3 years ago and one of the
new fitters was a former employee for FGW at Reading Turbo depot. He was
saying that staff at Reading were set to work in teams, (eg: those with
electrical expertise would work on electrics.) Whereas at Aylesbury, all
fitters end up doing all types of work. Could possibly be an issue...