Beware. Solid Air is a pay your own rating outfit with no salary but 100 Euro a day pocket money for F/O's.... Ryanair behaviour in corporate land
What are you after? Most corporates have no schedule so you might be working or have to be available 24/7. NetJets is run like an airline and has stable rosters so that might help.
London Executive Aviation is also a good outfit, stable has been there for years and a young expanding fleet with mainly new aircaft coming in.
www.flylea.com
Another decent operator is Privat Air.
Good luck!