Have just discovered Pegler Terrier i-Temp products, don’t know much about them and unfortunately there’s not a lot of information on the site. The intriguing thing is they mention a PC Programming dongle with some software to control the individual TRVs, but that’s about all they do say.
Update: I asked the manufacturer about the PC dongle and they pointed me to a different website. Even though the page is entitled ‘New Accessories’ the PC dongle is only “Compatible with Windows XP or Windows Vista operating systems.” It would appear that you can program multiple TRVs using the PC application, but there doesn’t appear to be any live control or facility for using a smartphone.