Many, many thanks. The Victoria Miniatures figs are perfect. I looked at them about 14 months back, when looking for conversion parts for my old GW IG, and had forgotten completely. Probably place an order this weekend.
I think the head swaps on the Cadians in the second pic are from Statuesque Miniatures. They made some excellent stuff, and service has been outstanding in my experience.
Thanks again, it is much appreciated.