Thanks for your time Weirdy and Simon, most appreciated!

Currently tossing up whether I just go straight passive; or
I keep the two preamps but run them into two completely separate, mono, output jacks,then just tape two mono cables together and run one to each amp/pedal setup. If I want a single signal I can plug them both into the LS2 (which had minimal hum) or a really basic passive ABY box like this http://www.swamp.net.au/alctron-guit...-signal-router.
I assume I'd have to provide separate power to each path but I've got a double battery cavity routed out.

Ah well,more to think about