a shovel of some sort, warm waterproof coat, water (I carry a gallon container) first aid and if possible hazard beacons. I only have the last two because they are the Law in Germany, should be law over here as well.
I worked in edinburgh for a year, and the first thing my employer gave me on my first day (apart from the heebes) was a shovel. I thought he was mental - until the first night I had to use it!
Really should be carrying a shovel about too - back to work tomorrow and that means a 40 mile round trip.
Am feeling very happy because FINALLY I am getting my business account sorted; am watching a very funny (albeit American) show called Psych and I've found half a bottle of wine in the cupboard . Hopefully it's not off