An ATR42, or was it 72, but an ATR anyway.
As for an early morning departure BFS-LGW, it's been discussed before and isn't happening as they don't have the slots for it. At the minute all BFS-LGW and LGW-BFS are operated by LGW based A319s. Not sure about a 6th? based 737 either in BFS, some have already started leaving the fleet and not sure what availability there is.