The summary of the programme:
A compelling drama documentary about one of the world's prolific and most diverse art forgers. The Greenhalgh family lived by modest means on a council estate in Bolton but, tucked away in the garden shed, Shaun Greenhalgh was creating fake paintings, antiques and sculptures that would dupe the art world out of hundreds of thousands of pounds. He was aided by his octogenarian parents, George and Olive (played by Peter Vaughan and Liz Smith), who concocted elaborate back stories for each forgery. Their trump card came with a fake Egyptian statue, supposedly passed down from George's grandfather, which they sold to Bolton Museum for nearly half a million pounds. Despite the windfall the family continued to live a frugal lifestyle, revelling instead in the satisfaction derived at deceiving the art experts.This will appear on the BBC's iPlayer once it has been broadcast.