Geoff,
I watched the last world cup whilst on the med S/France,we were surronded by all nationalities watching, the tv was turned so as to be seen through the front windows which were open, with towels on as sunshades. it was great,
I used a dish 80cm and tripod, I lined it up horizontaly with a compass (I think its 19.2 degrees east of south,) then verticaly with a sat finder, took about 10mins.(once you get it working scribe a line, or put a peice of tape along the LNB arm, line it up North/South it easier to find than 19.2 east of south)
You should also have the TV switched on and use the Signal test in the System set up, it shows two grey lines when you have a sky signal, its best to practice at home, copying dish directions and angles.
I have seen one outfit in n/france with a domestic dish fastened to the jockey wheel with a privat hedge infront and his reception was perfect, I too have had trees block the signal, but usualy when they where wet.its not to dificult to find a pitch with a clear view south.
I have since upgraded to an auto seek dish, it is brilliant, never failed yet.
Good luck mate