What I would have done with that Darren,Gutter vac bend on one end near end cap sucking and HP pole with a fan nozzle on swivel angled down, revs dropped, low flow and wash towards gutter vac bend.This is from the assumption your first image with next to nothing in is the before image. If moss clumps then gutter vac the lot.
I think I would have got that done with the vac and cleaned with the little washer and power pole. I might be wrong though. I'm now using 40mm carbon poles now and they are a pleasure after the omni alloy poles
I did say I might have been wrong Do you really live in Ashford ?
Steel ? I really like these ones over the alloy tubes but I do treat mine with real care and they are so light to lift from the ground.Jct 10 is the hospital one, my mate has his unit behind auto glass - Pierce precision if you ever need anything made.Did you find anything that really warrents any attention in Dover besides the immigrant problem I'm just outside Dover in St Margarets.
Apart from your water fed pole do you use any cleaning type chemicals to make it nice.