Many thanks gentlemen - I knew there would be the necessary knowledge out there somewhere. There is just one relevant hit on the Web for RC410 at
https://www.worthpoint.com/worthoped...iver-270586219 However, I cannot find a copy of the manual or circuit, either for sale or for download. When conditions permit, I shall travel over to Wales and liberate the receiver from the shipping container in which it now resides. The gearbox and switches alone should prove interesting and, who knows, a little light tinkering in the dark might yield some signs of life.
Best wishes
Peter G3PIJ