Can anyone recommend a good 'un? I lost a set of keys the other day, so now only have the one for my lock. Thinking a combination lock might be a good solution.
I would be careful abiout using a combination lock. Admittedly they are good and provide asafeguard against lost keys, but someinsurance companies won't accept them. Do check with yiours before investing in one
Depends where you are.
Your average cable lock can be cut by secateurs. A cable is fine for areas of low crime risk, for popping into WH Smiths to read the Comic or a cafe stop during a ride. For those times a combination is IMHO better than a key.
The only really good lock for anything more than a few minutes in town is a strong D-lock. I have a Kryptonite Series 2 for leaving my bike in the centre of Shrewsbury for a while.