For most of France, Benelux, and northern Spain a 60cm or 80cm dish will do the job if you want to get UK stations. With this you will need a Sky box with Freesat viewing card, or a Freesat (as in Freeview-ish) box in its own right, a LNB and tripod for the dish, a compass and a satfinder plus cable and connectors.
You will notice I did not mention Italy. If you look at http://www.digitalsat.co.uk/astra2dfootprint.html
you will see that to be successful in Italy you will need at least a 1m or 1.3m dish, and that is getting both unmanageable and will be very difficult to align as it's beam is so narrow.
If you are prepared to view nothing but BBC World TV and CNN (the world accoring to America)and maybe a few others in English and bucket loads of non-English stations then a 60cm dish will work wonders over most of Europe. Have a look at http://www.lyngsat.com/freetv/United-Kingdom.html
and look for stations you recognise on Eurobird, Hotbird, or Astra 2A South. Astra is at 28,2E and Eurobird is at 28.5E but you would need to move your dish as the inclination is different even if the azimuth for both may be near enough for a common dish position. Hotbird is at 13E.
www.satelliteforcaravans.co.uk and www.satcure.co.uk will give you a wealth of info.
Finally, make your mind up what you want and then consider buying it in one of the French DIY sheds (such as Leroy-Merlin or Bricoman) where you will find much better prices and range of kit than over here.