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I've just gone through the london winter and both my bikes now have a slipping freehub. Admittedly my mountain bikes' freehub is quite old and probably worn out, but I'm wondering if they are seized up inside and I can apply some lubrication to stop it from slipping? Anyone got any good advice?

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It can happen that the pawls get sticky and cleaning helps. Here's a couple of guides:

http://www.parktool.com/blog/repair-help/freehub-service http://www.bikeradar.com/gear/article/workshop-how-to-overhaul-your-freehub-23757/

Cold also makes it worse, but this covers much worse temperatures that the UK: http://www.icebike.org/Equipment/freehub.htm

(And while it's true that "flushing with solvent has not been a reliable substitute for full disassembly", if the freewheel isn't engaging at all, just drenching it with WD-40 can work as a short term fix until you get round to a proper job.)

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Agreed. Just to add to the list of possible workarounds, after flushing it with WD-40 I would "remove" it flushing with some volatile solvent (kerosene is my favorite), to remove dirt and rusty substances, then slowly embalm its inside with high-viscosity oil (gearbox oil is my favorite, it's like appropriate for this application "by definition"), which is thick enough to work as a freewheel lubricant, and at the same time fluid enough to go inside the freewheel by gravity and capilarity. –  heltonbiker Feb 22 '13 at 12:34

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