Original sentence: " Listening to numbers stations in the UK is illegal under Section 48 of the Wireless Telegraphy Act 2006 , so it is unlikely you could get official permission to listen to them; however, it is unlikely that the legislation would be used to prosecute those who listen to the stations privately
Edited sentence: " Listening to numbers stations in the UK is illegal under Section 48 of the Wireless Telegraphy Act 2006 (except if you're the 'intended' person, so if you're the intended spy you are not commiting an offence according to the Wireless Telegraphy Act, but you probably commit some other offences), so it is unlikely you could get official permission to listen to them; however, it is unlikely that the legislation would be used to prosecute those who listen to the stations privately