Billy Bunter in the Comet
Billy Bunter appeared in the Comet in various formats from 1950-1958. Issues 85-96 were reprints from earlier Magnets but issues 97-135 contained genuine new stories by Frank Richards. Later issues were in comic strip format. You can find more information in the publications section of The Greyfriars Index
Issues 426-437 contain the 'Mick the Gypsy' (Magnet issues 819-823) story in picture strip format. You can read issue 428 here.
Issue 101 contains an original Bunter story called 'Bunter's Brainwave'. You can read it here.
Issue 106 contains an original Bunter story called 'Was it Bunter?' You can read it here.
