Jonathan Creek: Miracle in Crooked Lane (1999)

A former glamour model, now living quietly with her rich, older husband in the countryside, is seriously injured when her garden shed explodes, leaving her badly burned. However, a reliable, independent witness insists she spoke to the unharmed woman several hours later as she went to church. Jonathan investigates with the help (and hindrance) of his rapidly growing fan club, all of whom dress exactly like him; two of them even live in windmills.