It is widely reputed to be illegal as far as the CAA is concerned, though I have no idea if this is true.
Obviously, for a private strip, you would just do it and not tell anybody. However a smarter and more secure way might be to use SMS control - there are various boxes on the market (
example) which will turn things on/off using SMS. I have one right next to me, enabling various routers/switches to be reset with an SMS.