I have undertaken a few European trips in my M3W.
All the tyres have puncture sealant in them which is supposed to seal small punctures even in the front with tubes. The following is a list of what I also take in no particular order.
Spare front inner tube, tyre levers, jack, exhaust/rectifier bobbins, spare cam belt + dowels to fit, large cable ties both plastic and metal, spare throttle cable, set of imperial and metric Allen keys, set of open ended spanners, spanners to fit the rear axle nuts (can't remember off the top of my head the sizes) spare fuel pump, assorted screwdrivers, gaffer tape, tyre pump.
Having said all that I have never had any problems, the cam belt did come in useful for another M3W once though plus the cable ties and tools have helped others. All these parts/tools fit in a box underr the bonnet.
