Used a 39cm dish at Lacanau, just west of Bordeaux recently with excellent results despite awful weather. Using a Maplin (Comag) SCART receiver so not Sky but as I understand it's all the same satellite (Astra 29E?)so perhaps not a problem.
It varies with the atmospheric conditions, whether a solid dish or perforated, dish shape and type together with the quality of the LNB and indeed the decoder.
The normal guidance will be that you need a 60cm solid dish to be confident in all conditions.
I have compromised to minimise bulk weight etc and gone for a solid 54CM Triax. The previous Maplins suitcase job [about 40CM ] failed as often as not this far down to the point of irritation so I am hoping the new Triax will tip the balance; will know next week.
i used a standard skye dish with a standard LNB and a standard skye reciever , in Carlucet in the Dordogne region of France last year , and picked up all the channels that i get at home ,in fact my wifes cousin lives there and thats all they use .
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