The Bill Series 22 Episode 79 Sum and Substance

Stuart and Sam investigate an arson attack on a foster home, and suspect the boyfriend of the owner's daughter may be responsible. Unconvinced that the man's watertight alibi is kosher, Stuart continues to dig and discovers several links to the B&B fire that he and Sam investigated several weeks before, while witnesses place the suspect at the scene of both attacks. Meanwhile, after investigating a laptop theft, Phil and Mickey set up an operation to catch a scammer trying to sell on illegally smuggled banknotes from the US, which have been coated in black paint to avoid customs, after several of the supposed notes turn out to be nothing more than blank sheets of paper.