When I first wrote to them this time last year, their requirements were as follows:
UK ATPL, 1500 hrs with a large portion on large multi engine airplanes - ATR, ATP. Saab 3000 series, DH7/8 etc.....or a rating on the bus with 500hrs on type and 1500 total, they also like ex-military guys.
It's like everything though, if they can't find enough people with the experience listed above, then they have to look at the next rung down.