Remember as well that the further north you go the weaker the signal is. If suffering from signal attenuation due to rain (rain drops of particular sizes can block a 10Ghz sat signal) then the only way of improving that is to raise the signal level. Which means a lower noise/higher gain LNB and also a larger dish. Proper alignment might help but some areas are known for local weather that will constantly drop out the signal.
I remember during Sky's analogue days that they used to recommend an 80cm dish (over the usual 60Cm dishes) for anyone above a certain latitude. The digital dishes are also now even smaller.. Looking though at the footprint charts they do say 95% of UK mainland can get astra2 on a 50cm dish, these though are ideal scenarios
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