Thank you both very much indeed for the lengthy and interesting posts, they are much appreciated.
I’m currently using Micron and Sennheiser radio mics perectly happily alongside the boompole.
I generally don’t need all four tracks kept separate, hence the mixer.
The RF link, mixer-camcorder, would be an added advantage if it works realiably enough. No great distances involved here, just freedom of movement for the guy looking after the sound.
Alan