I’m a licensed Amatuer radio operator in the US. The radio you linked to is a little short on power. .5W won’t get you much range. Although it is using UHF frequencies which is best used in buildings with walls or other barriers. The higher frequencies work better with barriers, trees, etc in between radios. The pmr radio the gentleman linked is built by Motarola which is a very trusted name in radio communications. Although it also has just .5W power, the reviews I read were good talking about kids had good results using them outside with decent range reached. If you could find a GMRS or FRS radio with more than .5W power I would give it a try. More power gets more range. And these type radios are open frequencies that do not require a license to operate on. Atleast in the US they don’t require a license. It looks like you found a source explaining the rules for the UK. Good luck. If you have any questions, I’ll be glad to help with any technical questions about radios.
BusinessRadioSimpleUK.pdf
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