Incidentally, I am the 'Roger' referred to in Geraldine Teggart's article in Set Dancing News'

I help with modifying figures for the sets and teaching and calling. The amount of modification depends on the individual sets and precludes certain movements e.g. 'dancing around the house' which is usually replaced by a 'lead around'. The music is slowed down, though not by much, most figures being danced to between 80% and 85%.
Mostly we have a set dancer pairing with someone with Parkinson's, which works very well and we usually have between two and three sets.
We've just enjoyed our third Christmas dance and Geraldine is to be congratulated on running a very successful group. I know that I speak for the set dancers involved when I say that we find it very enjoyable. As for the Parkinson's sufferers, well, they do keep coming back for more!

Rog