Michael Hopkins, a partner in the business, said: “We have a site called www.shirtnly.com and when we have new products in the shop we usually write about them on our blog.

“The costume department on the film wanted the shirts for some police or soldier-style characters.

“They found them on our site and the call came three months ago, but we kept it to ourselves.

“They were asking how many we could supply and the number they required was over 100.

“They took delivery six weeks ago and they’ve just given us another order for 25 more, as well as 80 black ties."

Michael added: “They were very easy people to work with, absolutely excellent.

“I was interested to see that when they sent a payment the account is made up in the name of the film.

“There’s no little subsidiary, it very clearly says the account is Harry Potter and the Deathly Hallows.

“The fact that they came back and asked for more must mean they’ve been happy with the service we provided.

“I’m hoping that we’ve built up a bit of a rapport with them and it might lead to more.

“Who knows”?