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start simple.

Get ya self a can of WD40 lift the bonet and give it a proper good spray.  WD40 works brill for damp starting, My dad swore by it and so do  I

ps Petrol or diesel?

Normally it's your HT leads breaking down or just dirty leads allowing the spark to run to earth. Clean them and give them a spray of damp start  orWD40 to seal the ignition and distributor, that should cure it temporarily

The other cause could be the seal to the drain pipe from the heater intake box has failed allowing the water to drain onto the leads. that will also do your exhaust to manifold seals eventually and it will start misfiring on overrun.

It depends on what and when the last service was carried out.

A new set of leads, coupled with a new set of plugs, and distributer cap (should it have one) Will certainly not do any harm.

But firstly if it was just the damp starting problem I would go with the WD40 or dampstart. If this does not solve the problem, go for the leads,plugs airfilter oil filter coupled with some fresh oil. If this doesn't  solve the problem you have lost nothing whilst you inspect other areas such as coil. But generaly if the bus runs ok nomaly but not in the wet/damp then it sounds like just a breakdown in the elecrical system through damp.