Continuing his long and successful theatre career, in September 2005, Lyons joined the cast of the world's longest-running play, The Mousetrap, in London's West End. In 2015 and 2016, Lyons toured the UK in a stage adaptation of the BBC amateur detective series, Father Brown. He is, also, a regular performer in Pantomime throughout the country, and appeared in the role of "King Crumble" in Sleeping Beauty at the Marina Theatre, Lowestoft in December 2015. Lyons also appeared for the second time as special guest at a 43tv Retro TV Sweeney Meet in October 2016 in Hammersmith, London and gave an after dinner talk about his career in TV & Film.
