[Kymmy]

An old Sky digital dish will work fine (an analogue dish (60 or 80cm) will be fine as well but you will need to probably swap the LNB for a new one..)

From London if you want English speakng channels then best to go for the Astra2 group at 28.2E (same position as Sky) where all the freesat channels are and either a FTA setup, Sky box with Freesat card or a Freesat box will do you.. In the end it depends on whether you want just basic channel viewing, or if you want the extras like 7 day EPG, reb button, HD, interactive services and even iPlayer