ARW wrote:

Is it as simple as getting the ladders off the van, swapping it and then
looking on the Sky tuning menu for signal strength. Maybe a small tweak
if needed (and that can only be a rotational twist of the LNB as the
dish is already aiming in the right direction) and then you are done

Should be, can be easier with a satfinder for under a tenner

http://www.ebay.co.uk/itm/SatFinder/391364735812

Saves playing "bernie the bolt" with instructions from somebody in the
lounge relaying information to the person at the foot of the ladder