How difficult is it to get a visa for my Thai GF to visit the UK (and Spain) on business? She will be working for me at my office in BKK, but I want her to come to the UK for 1 week to visit my UK office, and then onto Spain to visit my office on the Costa, before returning to BKK.

Will the UK embassy in BKK think I'm trying to pull a fast one to get her into the UK?  (The last thing either me or my GF would want is for her to stay in this miserable, cold and expensive country called Britain)  

Any advice appreciated!

If your company is considered bona fide by the Brits and the Spanish it shouldn't be too difficult. Modest dress to be worn to visit both Embassies and a decent letterhead letter to both Embassies requesting a visa and an undertaking to take care of expenses etc should do the trick.

Thanks!!  Is that modest dress to be worn by me or my GF?  

Her in particular,   but it won't harm the case if you too present  looking businesslike rather than ready for a day

at the beach