Given the replies and my current (no pun intended) bike being a naked BMW R80 with heated grips the route I think may be best suited to me is to fit some bark busters to give some wind protection for my hands. Then to add a heated jacket to give some warmth to my upper body. The engine will protect my feet. I may at some point fit a screen to reduce the wind chill / buffeting / noise.
The additional drain on the battery will be around 110W so should be achieveable - I would be interested to know if Grant fitted a higher output alternator to cope with normal running plus two sets of heated gear. If I have any doubts about too much current drain then that can be alleviated by fitting a higher output alternator - there is a 450W version that can be slotted straight in. I am fitting a voltmeter to keep a check on the battery.
I have no doubt that I will, at least for the first year or three, get off the bike without unplugging a high proportion of the time so I will be making sure that I can unplug without damaging the wiring.
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