All the usual culprits plus waterproof plasters in various sizes. Also keep a pile of old(ish) Tea Towels in the car use to give the gear a final wipe down if it's been raining before it goes in the car. ( I found my mother had at least 3 dozen TT in her airing cupboard doing nothing. Apparently TT were given as presents years ago, much the same as mens white cotton handkerchiefs !)
Mobile phone, an absolute 'must' if health is a problem. Also have details of my recent health issues, dates, medication etc etc ( The wife insisted !!)
Whilst on that subject: I ALWAYS give my wife a rough home time and its an unwritten LAW that anything outside of this I MUST phone - fair enough IMHO........
Oh, one last necessity: AA or RAC membership Roadside (min) or the full monty if travelling far and wide on a regular basis......I was caught out once - never again !!!!