I live in Weston super Mare and regularly use Citywing from Gloucester to IOM. The drive takes just slightly over an hour (not rushing) and there is still free parking at Gloucester. They operate the LET 410 aircraft, 19 seats and flight time is just under an hour. I've used them since 2010 (they were Manx2 then) at least twice a year. Used the Bristol IOM service once only and wouldn't ever fly with them again.
And no, I have no connection to Citywing apart from being a regular passenger.