TV Editor Tonight's top telly tips include a documentary with a difference about a cult rock singer, Tommy Tiernan, The Masked Singer, Line of Duty - and some cracking movies . . . Pick of the Day King Rocker, 9.00pm, Sky Arts & NOW TV It may be far from the ideal thing to be watching on a Saturday night during a pandemic, but this quirky documentary about a relatively unknown musician is well worth the effort. Not everyone with a guitar wants to be a star . . . Comedian and writer Stewart Lee ( Stewart Lee’s Comedy Vehicle) , director Michael Cumming (Brass Eye, Toast of London) and James Nicholls (Fire Records, Fire Films) investigate the mysterious existence of Robert Lloyd.