Just realised I had written all that stuff about not growing Masdevallias again, and I went and bought five of them! Looking through your pics ( again! ) Paul shows how irrestisatble the Pleurothalid alliance really is!
This time I have my east facing room, humidity tray, ventilation fan, I I have put a small tray of water infront of the fan to boost the humidity of the 'blowing air'. Lower winter temps are actually easier to acheive here than they were in the UK with a centrally heated house or a greenhouse maintained for intermediate type orchids!