One made it up and one broke the rules themselves.
https://www.dailymail.co.uk/news/article-8372911/Boris-puts-Dominic-Cummings-chance-one-witness-admits-sighting-aide.html
\\The Mail on Sunday can today reveal that a retired teacher who reported the No 10 adviser to police broke lockdown rules himself – while a supposed ‘witness’ who claimed Mr Cummings had made a second trip to the region admitted he made his statement up as a joke.//
\\Tim Matthews said that he doctored the details on an app used by runners to record routes and times to make it seem like he had seen Mr Cummings in Durham six days after he had returned to London.//
Lied, made it up, if I was Mr Cummings i'd sue.