Hi Gone U/S,
We had to have 2 references of management level. But we could have also put other business references if we wanted to. Both referees have been called.
As we are being hired ( hopefully ) by a company called Mam for contract work to QF it might be different to what your requirements are.
I think you should take it as a positive they only ckecked one. Perhaps they only had to check off the reference as a formality because they already knew you were suitable for the job.
Good luck with it all and let us know how you go, I have my fingers crossed for you.