Which channels you want to watch ?
Don ´ t forget, this satellite is not for DTH but for contributions (feeds, permanent or not)
There are not so many FTA channels available in dvbs dvbs2 at this position. (I am not talking about ns3/4 contributions, this position is also a paradise for such modulations).
Unfortunately I am not in ul and London , I can' t help you more than this .
1.8m is probably the minimum dish size for a permamnent correct signal in CBand