Merziac thanks for a great tutorial that solves the problem on getting the adjustment ring off/on without damage, I'll be assembling the tools you use and keeping your posted pictures for reference.

On the removal of the fixed cup on the other side I've decided to go with the Stein Tool remover. I like you like the idea of getting both cups out to service and check everything in the bottom bracket before re-assembly and this tool looks to be both well made, reasonably priced and simple to use.

Again thanks for you advice.