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I ended up just going straight to them (Support and Sustain on Denmark Hill, lovely people - not shilling!) after my partner threatened to amputate me if I half-complained about it again.
Had the initial 30 minute assessment and we had a laugh about how inflexible my hip flexors are and the lack of lateral strength in my legs, set up a few exercises went back once a week for two more sessions by which time the ache had stopped and I just continue to do the exercises a couple of times a week to try and make sure it doesn't come back
The short answer is what DJ has already said.
For what it's worth my experience turned out to be that my quad wasn't firing properly making the rest of my leg take up the slack which lead to my patella not tracking correctly. A couple of weeks of physio to retrain it and all is well again.