I don't really, unless you class the original signed photograph of Dennis Waterman (I just wish I had a pic of me sat on his knee in the Barratt show house when he signed it for me - I was about 4 at the time ) and I do have an original signed postcard by Tommy Cooper....

My dad on the other hand (call it memorabilia or not depending on what you think of him), has a set of white signed boxing gloves from Naseem Hamed which came about after my dad left his second wife in charge of the shop one afternoon and when he got back, she'd managed to sell two Bang & Olufsen sound systems to him!