I think that should fully charge your batteries in 5 hours.So many options! - thanks all. Love all the input.
In the end I ordered this 21v charger http://www.ebay.co.uk/itm/221213087522?_trksid=p2057872.m2749.l2649&ssPageName=STRK:MEBIDX:IT
and plan to parallel charge at work on my desk with a single lead. Should put in enough during the day to get home and I will balance charge at home with all the fiddly balance board/taps. Anyone want a (noisy) aluminium 62v charger?
You've given me an idea to get the 25.2v 6s version of your charger to bulk parallel charge my 6s packs but first do let us know how you get on with it.
I also like the look of cwah's charging unit too.