Billy - Tom Holland / Mrs Wilkinson - Stephanie Putson (Understudy) / Dad - Joe Caffrey (who was the original Tony) / Tony - Craig Gallivan / Grandma - Ann Emery / George - Trevor Fox / Mr Braithwaite - Sean Kingsley / Dead Mum - Sorelle Marsh (2nd Understudy) / Billy's Older Self - Shaun Walters (alternate) / Michael - George Maycock / Debbie - Megan Jossa