Help with car problem

[macp]

Evening all

I have noticed that my wifes Fiesta when hot gives of a smell like hot radiator water.I noted water under the car and at the back of the engine bay.I also noted the water in the reservoir has dropped.I thought it was HGF but the oil seems ok no evidence of water in the oil and the temp guage remains bang in the middle where it usually is.The radiator seems dry and the water is coming from the back somewhere but the engine block seems dry too. Any ideas ??

[macp]

Im stumped just been out to have another look and I cant see any leaks from any visible hoses ?