Hi mulls74 & cts
It has been posted on many boards that people are getting good reception through windows, even double glazed ones. Depending upon circumstances, ie location and type of glass, dishes from 45cm up to 80cm have worked.
Personally, last year when the subject came to the for again, I used a 45cm minidish on my swivel computer chair in an experiment. Looking through the 15mm gap double glazed window of my lounge and then through the PVC twin wall roof of my conservatory I obtained signal from some of the satellites ranging from 30*west to 39*east. Not all of the satellites or all of the transponders on the ones that I did pick up. It was also a fine summers day.
Basically you have to try it and see if it is at all possible from your location. There was a poster on DS located in Aberdeen who regularly reported that she was getting good reception from $ly through the window of her flat with a mini-dish, cannot remember if it was a zone 2 dish or if the window was double glazed.
Also, as Analoguesat mentioned, the window must be in the correct orientation for the dish to see the satellite.