Shaun,
I've used two different types of pole, an Ionic 18' fibre-glass pole and the Unger poles.
Unger are far better; lighter too; with the back pack because your pole hose is outside of the pole, so you get extra reach without having to move the backpack.
Black Ionic pole hose is excellent too, since it's easy to 'nip' when you want to stop the pump pumping.
I use an Ionic brush head but I guess a 10" Vikan would be ideal.
Also a 100 gallon RO/DI would provide you with more water than you could possibly use.
One or two 200 litre water butts would be fine and around five 25 litre barrels.
I'm not going to google the links up for you, but I'm sure you can do that.
Good luck!
Oh, and you can purchase a backpack from E-Bay from the USA for around £140 plus around £30 VAT and UK delivery; so about £170 in total.