I loved my one trip on them, LCY-EDI on a DO328 turboprop. Was charged a full J fare (something like GBP 200 one way -- and yes, I know that on intra-Britain flights J class = fully flexible economy) to sit in the last row of the all-WHY cabin, and most importantly earned NO miles on any carrier.

That said, the staff were quite pleasant and LCY's a fun airport to fly out of.