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As I'm sure you know Granty, I am a complete fan of quality specific hill training, which, amongst other things, will strengthen your quads.
The static exercises you could also do are:
Quadriceps
sit upright on an upright chair, feet 6 to 8 inches apart, then slightly tense your right quadricep (muscle at top of thigh), lift your right leg with knee remaining bent, hold for a count of 3, lower and relax, tense again, lift, hold, lower etc. Repeat 10 times, then do exactly the same with your left leg.
You could then repeat the whole process with both legs. It doesn't sound very strenuous, but it's effective if done daily. You could also get yourself some ankle weights and do this exercise with ankle weights too.
Hamstrings
Lying on your stomach, keeping your knee straight, lift your right leg backwards from the hip slightly, hold for a count of 3 and then lower, repeat 10 times, then do the same with your left leg. Build up to 3 sets of 10 on each leg. Again, you could add ankle weights as your muscles become stronger.
There are quite a few things that you can buy that aid resistance/strengthening exercises these days. Argos, and large stores of Asda and Tesco sell them quite reasonably.
Hope that helps, SE probably has some ideas too
