There is more in the world than just the UK
You guys should know that the world is slightly larger than the UK. In fact, that little Island is not very significant.
All of you who are replying "no no no never never never" should stop whining and start looking at the rules. It is perfectly legal to have equipment which is has an airworthiness certificate on board and turned on. For example, my hand-held VHF radio has been designed especially to be used INSIDE an aircraft. Whether as an emergency radio, or as a secondary communications device.
In case of TS, I doubt it will be certified. But stop whining of you don't know what you're talking about.