I was also going to say gel filled wiska boxes with the earthing bar for the SWA but after sideys comments im unsure how one would stand up to a spade strike.
I haven't used Pratleys before,,, but I don't think that there's going to be enough money in the job to use them.... There are going to be 6 fittings in 3 different locations (prob each pair being 6' apart) so I'd have to use at least one per pair if not one per each fitting (dependant on the distance)...