Hi guys
From recent experience I know newbie pilots tend to start on the B757/A320/A321 fleets, subject to operational requirements. To my understanding, no-one gets to fly the B767 until they have made rank of senior first officer (obviously subject to hours).
As a rough guide, this is where we base the various aircraft
LGW - B757/A320
BHX - B757
MAN - B757/A320
EMA/BRS/STN - A321
LTN - A320
GLA - B757
I think new aircrew are usually distributed according to current demand.
Please note I'm not a pilot with FCA so have no idea of the recruitment process - sorry! But I thought I'd try to shed light on Rikers query a bit.
Good luck with the forthcoming interviews!