Short answer, don’t believe anyone has yet. There is a groovy for ST API for Evohome TRVs, that may be a good starting point for your mate.
I have been looking at the heating side of automation for a while now. I read a lot of negative reviews for the LWRF TRVs, mainly regarding excessive noise, and its timer function isn’t 24/7. I am not ready to commit to a heating setup right now, but if I were, it would probably be the Honeywell Evohome.