Large 12v Saorview TV?

Google '12v tv', there's plenty of companies in the UK selling them for caravans, motor homes & boats.

Here's the first six off the top of the list.....

http://www.12vtv.co.uk/
http://www.wedodigital.co.uk/12v-tv/
http://www.amazon.co.uk/tag/12v%20tv/products
http://www.outandaboutlive.co.uk/forums/Motorhomes/Motorhome-Matters/Which-12v-TV/29404/
http://www.capitalstores.co.uk/12v-tv
http://www.acdctv.co.uk/12volt_television.html

I know you mentioned Saorview but realistically I'd say that unless you find a big 12V TV that meets your requirements in Power City or DID, you'll probably have to buy a Saorview set top box.