Sally Jane Adey, 57, a solicitor from Shropshire.

She and her husband, Robert, were on a holiday cruise aboard the MSC Splendida, which docked at the port in Tunis early on Wednesday, and had gone on an excursion to the museum at the time of the attack.

The prime minister Cameron expressed his condolences to her family, saying: “We will do everything we can to help the family at this very difficult time.”