Some brilliant answers there, thanks fellas, will look into it - just need it for occasional use at moment, but will need to use more when i go wfp early next year.
Blue frog - thanks for the reply, however, as mentioned in my post i just need it for the occasional use for connie roofs or even for connie cleans ie cleaning down the upvc as quicker than using a cloth (dont necessarly need a wfp system for that) also for those hard to reach windows (especially if the upvc/sill is minging). I would then trad the windows as normal with squeegee on an extention pole.
Thanks again guys