I guess Simon Rawcliffe is the best person to contact ref jobs on the shed, he's the flt ops director. You can see his piccy on the company website emerald-airways.co.uk, he seems to be doing all the hiring and firing right now.
I wouldn't bother trying to coldcall as you're unlikely to get past the switchboard operator anyway.
What are they like to work for ?
Well they're not that bad if you can fly manually ,be up all night and accept the Emerald ethosthat they only spend any money when they really have to.