Thanks for the replies and I hope it has put the issue to bed, not that I set out to sully the name of Varistream but with the research I did yesterday it had to be said - nothing worse than a piece of kit playing up when all we want to do is earn money and, like me, other guys on here have bought new equipment as a direct result of the sub-par performance of this particular controller.
Tosh - I would love to work without a controller, the less tools the better in my opinion but I work on my own and when I think of those long summer days working with a couple of new cleans thrown in I fear there would be too much wastage but it's great that you can work like that. In an ideal world I would work on 'b' all day everyday!
I have calmed down a little since yesterday and the good bloke at South Yorkshire Caravans at Dinnington put my battery on power charge allowing me to finish my weeks work yesterday afternoon. Admitedly I had been using a 4amp 12v charger which hasn't been topping up the battery enough HOWEVER - I have been using this cheap little charger with my old 110amp leisure for the last four years and the old Varistream worked off the available charge fine including increased flow and busy weeks. (And filling up my fish tank when it needs cleaning)
So what I intend to do is keep the controller and borrow my Dad's charger which is a little beefier, charge more often than once a week and hopefully I can maintain the status quo, I have already paid out for a controller and battery I probably didn't need to. I shall have a think next year when I replace my van if it would be worth getting a new one.
The bottom line is the old Varistream allowed for a lesser charge in a battery and encorporated the flashing LED green light to inform the user it would be advisable to charge whilst still providing adequate flow often for days.
The new Varistream is less forgiving with a part charged battery and has abandoned the LED green light notification in place of a 'L' digit and almost immediate shut down. The green LED light now flashes upon reaching maximum water pressure despite having a 'P' digit to inform you of exactly the same thing. The 'l l' digit is lost on me.