A painting which lay undiscovered at the Thames Police Museum in Wapping High Street for 25 years will be officially unveiled on Saturday (October 2).

The painting, which shows the Royal Salute taking place at Greenwich Naval College, was found by museum curator John Joslin under a pile of rubbish destined to be thrown out.

Devon artist Mackenzie Moulton, 63, was commissioned by ex-Superintendent Edward Allen of Wapping Police Station to paint the oil on canvas artwork, which features the Royal Barge accompanied by the Green Police Launch saluting the Queen.

Mr Moulton said: “I completely forgot about it.

“I don’t think it’s ever been up in the museum.”

Both men will attend the official presentation of the painting to the museum and will be joined by Lady Cynthia Stephens, who replaced the Queen Mother as the patron of the Thames Police Association.

Mr Moulton was commissioned to paint a portrait of Lady Stevens in 2006 which also hangs in the museum.

The presentation will take place at 12.30pm.