LONDONDERRY, NORTHERN IRELAND - MAY 09: Hugh Craig (centre) from Moville in Donegal shows the Prince Charles, Prince of Wales and Camilla, Duchess of Cornwall a Linac machine on a tour of the North West Cancer Centre at Altnagelvin Hospital during a visit to Northern Ireland on May 9, 2017 in Londonderry, Northern Ireland. (Photo by Niall Carson - WPA Pool/Getty Images)
