SWL,
A quick search turned up this Ofcom document:
https://www.ofcom.org.uk/__data/assets/pdf_file/0022/103297/fat-ism-frequencies.pdfAlas, early on this states:
"In the United Kingdom the use of ISM apparatus is allowed provided it does not
contravene the provisions of the Wireless Telegraphy Act 2006. The International
Telecommunications Union defines ISM in the Radio Regulations as:
“industrial, scientific and medical (ISM) applications (of radio
frequency energy): Operation of equipment or appliances designed
to generate and use locally radio frequency energy for industrial,
scientific, medical, domestic or similar purposes, excluding
applications in the field of telecommunications.”
I found more of the same at this location for UK frequency allocation Again the Wireless and Telegraphy act is cited, but I have not had chance to try and decipher that particular document:
http://static.ofcom.org.uk/static/spectrum/fat.htmlI suspect that any intentional radio emission with the intent of reaching significant distance is forbidden, but have yet to find proof.
Ed