I've just got hold of a few of these battery controller trickle chargers. My friend works in the trade and has just bought a load in from the manufacturer in Italy.
http://www.batterycontroller.co.uk/easy6.html
I've been using one for the RSV and they seem like a really quality piece of kit. They are going for £42 each on amazon and wemoto (http://www.wemoto.com/parts/picture/bf-706debce6p-uk/)
I can sell them for £35 posted each, if anybody is interested.
Battery chargers (£35 posted)
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