Thanks for the answers. That's pretty clear now as to what I would get by going the UK route and tallies with what I see on the UK reseller site that I have been looking at, i.e. I only see RA2 Select which is what I would want if I've understood correctly so that's good.
Sorry for being a bit slow but I do want to make sure that I would be pursuing a solution that would work the way I think it would if I were to go for the UK RA2 Select option.
The system I am envisaging is a three-hub system. I currently have a latest gen Philips Hue hub and all except one of my lights are (or are planned to be) Hue smart bulbs. My plan is to add a Lutron RA2 Select Main Processor (https://www.mr-resistor.co.uk/item.aspx?i=19600) primarily to be used simply to monitor button states on all of the Picos I plan to install in place of my existing dumb wall switches (all would be UK-sourced to ensure frequency compatibility with the UK-sourced RA2). I would then add a Hubitat hub to pull it all together and am assuming that the Lutron integration would allow my Hubitat to see all Pico button events in my home reported via the Hubitat Lutron integration (in my case coming in via an RA2 Select hub) and I could then program Hubitat as I wanted to map the various button events to appropriate Philips Hue actions (on/off/dim/scene-change/etc) to be executed by my Hue hub using the Hubitat Philips Hue integration.
Initially there would be no output devices (inline switches, dimmers etc) connected to my Lutron hub although ultimately as I get more confident there is one designer ceiling light, a couple of extractor fans and a kick-plate heater that I would definitely want to integrate and since I would have an RA2 Select hub already it would seem simplest at that point to buy the necessary 240V inline switching devices for those items.
I guess the one thing that I'm a bit unclear on is how I would control any inline switching devices I add. The tech docs and @bill.d's explanation both imply to me that the Picos communicate directly with the inline switches. With a system integrated with Hubitat using the Lutron integrator can I put Hubitat in the loop there, i.e. does the Lutron Integration Report (Lutron Integrator - Hubitat Documentation) also expose the inline stuff with unique IDs that once configured in Hubitat will accept actions from Hubitat?
Have I understood all of this correctly and does the above look like a coherent setup subject to clarification on controlling Lutron inline devices from Hubitat?
