Correction on the Flybe times.
This is 30mins on the 146 and 25mins on the Dash Q400. This is irrespective of the airport served.
Typically Flybe, as with many airlines will bolster in some longer turnarounds in a bid to combat delays incurred and LGW regularly has 40-45 minute turnarounds scheduled. However if the aircraft is running late then a maximum of 30mins is expected to turn the aircraft around...no mean feet at LGW where airbridges tend to be used.