Subterranean pig sick blues

Pincey gets a job as a car park attendant, and discovers an underground tunnel that leads to what he thinks is the door to a high street bank. He tells Billy who warns him to steer clear, but the thought of getting rich quick gets the better of Pincey and he offers the job to local gangster, Stretch, who agrees to 'blow open' the bank door and let Pincey have 10%. Not surprisingly things don't go as planned.