A good question, Pete. I have to say that (like Faca. Sam, Espy and Martinidave) the alox handled Farmer is my choice. It is the same as the military issued Soldier but has a woodsaw. The blade is thicker than the standard red plastic SAKs. The woodsaw works well and is a useful tool. The awl is an awesome tool that drills neat holes in most things.The alox handles are, IMHO, more robust than plastic. It is still an obviously non threatening swiss army penknife.They are readily available from US dealers on ebay, and with the exchange rate at nearly two bucks to the quid, it will be cheaper than buying in the UK high street.
Having said that, it does not have a Phillips screwdiver, scissors or a corkscrew, all of which I think are very handy in town.