O M G! It moves about 0.5cm inwards but the left doesn't move! It's probably due to me compensating for the wreckage of my right knee (shredded cartilage, meniscus and lateral collateral ligament). Might have to invest in some of these devices!!!Based on the purchase of these insoles I've also invented my own test on this @Brian Hamilton .
Put your foot on the ground, slowly move your knee forwards (as if taking a step in slow-motion) and watch the inside of the ankle to see if it move inwards.
Now do the same again, but this time prop something underneath the arch of the foot. Socks, padding, even the big toe of your other foot.
Compare the two.
If it's the same as me you may be surprised....