Airman Tour mini compressor £25
A compact compressor’s a handy thing to keep under your seat, along with your tyre-plugging kit. This one’s just 12x6x14cm, lives in a handy storage bag, comes with a choice of cigarette lighter, SAE plug or crocodile clips and claims to completely inflate an average bike tyre in just a couple of minutes. For bikes with Can-bus electrical systems though (BMWS from 2005, for example) you have to go straight to the battery. If you don’t need the accessories, there’s a basic version with Din/cigarette connection only for £19.