Auto Satellite TV Domes

SeeFarers

I am looking to buy a roof-mounted automatic sat tv dome for my motorhome.  I would welcome anyones advice on make, model and size from their experiences. 

I am not interested in using it on the continent (been there, got the tee shirt) but only in the UK, mainly northern Scotland and Ireland.  I only want Freesat, access to Astra 1 & 2 and twin LNB.  Quality and reliability are more important to me than price.

I have experience of sat tv using a manual, 85cm wind-up roof mounted dish and prefer to not go down that route this time.  I have an 8 metre, low profile van with a flat, mostly uncluttered roof, so the height of the dome is a factor but not at the expense of reception.