Film Shropshire, a new business in the town, helped bring the production to Shrewsbury as its first venture.
Mark Hooper, one of the partners, said Monday had been a “brilliant first day of filming”.
St John’s Hill has been turned into an 18th century London street, with a new road surface, signs and carriages.
“There’s so much local pride in Shropshire and residents and businesses want to do what they can to make it a success,” Mr Hooper said.
“I haven’t heard a bad word, everyone has been extremely positive.”