also thinking of going to St Cirq le Popie but realise its going to be heaving that time of year, is there likely to be parking for motorhome on outskirts - thanks for any possible info

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The aire there is good, although you'll have to be there quite early in the day to get a place - it's right on the riverside, just outside the campsite.
We have stayed on the campsite itself on a few occasions.
There is a parking area just to the right off the main road up to the village, although it's not very large, and quite sloping. If you walk from the aire/campsite along the riverside, there is a steep path up to the village (a bit shorter and more shaded than walking up the main road)