TCAS FAN
CAA even have a webpage on this:
https://www.caa.co.uk/Commercial-ind...nned-aircraft/
"Unlike small drones, unmanned aircraft with an operating mass of more than 20 kg are subject to the whole of the UK Aviation regulations (as listed within the UK Air Navigation Order - ANO), although they may be exempted from certain requirements by the CAA.
Because of this, any person intending to operate an unmanned aircraft with a mass of more than 20kg within the UK must obtain a specific authorisation, in the form of an exemption from some of the requirements of the ANO before any flight can take place. "