Thank you all for your comments. Still not decided on the way forward.
I've used ID11 & Miicrophen, Xtol before, but transitioned to liquid developers when my film throughput decreased as I lost confidence in their life. Not based on actually any experience, but I tended to not trust them surviving and made fresh stock solutions before transitioning to liquid developers.
I had a bad experience, with both Ilfosol 2 & LC29 failing on me, both well within their shelf life once opened. Only ever tried one bottle of each, and to be honest, thinking about it now, given Ilford's reputation\QC control actually think it might have been something I did rather than there actually being a fault with these,
I moved to Rodinal after that given it's bulletproof reputation & longevity.
I've had written off pyro developer before, mainly because in the past the only way I seemed to be able to get it would be to make it myself. It's not the handling the chemicals that's the issue, as I used to work in an analytical laboratory but the cost of getting the raw ingredients. I never seemed to be able to get them all in the same place, and the multiple postage charges made it uneconomical and at the time, I didn't have a lot of disposable income.
I will be potentially sourcing my final choice from:
https://ntphotoworks.com/Mainly because of the choice of product available, I don't think I've come across a better selection in the UK. (That's probably also an issue, too much choice)
They do make sample bottles of some of their product for people to try but I am not sure that I want to get into a testing regime to select the developer but rather pick one & test it with the films stocks I have, PanF, FP4, Kentmere 100 & 400, Tri-X, TMax 100 & 400 , some old Fuji Neopan 400 and even some Kodak Technical Pan.
One other way I am looking to hone my choice is the availability of reliable development times for the various film stocks. Information from the manufacturers and correlating with other sources, like
digitaltruth.com massive development chart.
ntpphotoworks do havenfomation on development times, some where they have carried out testing & some from their customers feedback. Others they defer to the massive development chart.
Thanks again for the feedback, off now to look at the pyro options, as these were a go to for one of the original founders of filmwasters & I really like the quality of these images.
Mike