Re:Accessing Publicly Available Information on the Internet ...
by timthorn on Thursday December 14, 2017 @04:19PM
(#15927166)
In legal terms, illegal and unlawful are not synonymous. In the UK, trespass is only illegal in certain circumstances: https://cps.gov.uk/legal-guidance/trespass-and-nuisance-land
Beyond that, it's only unlawful.
(https://www.merriam-webster.com/dictionary/illegal)