Hello again
Thank you both for your responses. I can now see that some producers & remixers do in fact appear in Artists list, but does seem hit and miss, but its a start to what I want. There is already a separate field called "Artists: Remixer" , so I can use that on my screen for the Remixer.
In relation to Zaks post about Tag Inspector..well you learn something new everyday! I been using Musicbee for about a year now ...and never knew about the Inspector. Took me a while to find it!
It looks like the majority of Producers appear in a field called Producer (Or ID TAG TXXXX/Producer)m and using a Custom Field, I've got them to show. Although there are some that appear in the Artists Split list, so I think I will need to look at some virtual tag to extract them too!
Thanks for all your help