As Genghis and the others have said, it's unreliable. However.....
For specific meetings at specific times of the year, and when logistics demand, I've flown. Including:
(i) Prestwick-Cranfield-Prestwick in a Chipmunk for a 2-day meeting;
(ii) Glasgow-Cranfield-Newcastle-Perth-Prestwick in a Pup for 3 different activities over 4 days;
(iii) Prestwick-Benson-Prestwick in a Chipmunk in one day! (7am start, 21:45 finish!)
The latter was a short-notice job, and for self plus colleague was actually cheaper even than EasyJet with a hire car and/or hotel.
For all, the EasyJet/hire car alternative didn't bear thinking about.
It can be done, but chose your occasions!
(And in case you think I'm singling out EasyJet, I'm not - they're just the only low-cost alternative for me since I refuse to fly RyanAir)