A memorial service attended by Prince Harry will be held at Westminster Abbey on Tuesday to honour the British victims of the Tunisian terror attacks.

Thirty-eight tourists, 30 of whom were British, were killed in the beach massacre in the resort town of Sousse on June 26 last year after gunman Seifeddine Rezgui opened fired on holidaymakers before being shot dead by security forces.

Terror group so-called Islamic State (IS) claimed responsibility for the beach attack as well as a separate attack at a museum in Tunis in March of the same year.

During the memorial service Prince Harry will lay a wreath at the Innocent Victims Memorial on behalf of his grandmother the Queen as he joins together with the families who lost loved ones and survivors of the attacks.

He will also deliver a reading as he leads the tributes to those who lost their lives in the worst incident of terrorism involving British people since 2005's July 7 attacks in London.

Last year the government announced it will be funding a permanent memorial dedicated to the Tunisian beach massacre victims and a separate site of remembrance will also be created for all British nationals killed in terrorist atrocities overseas.