The U.K. has what's known as their Protection of Military Remains Act. It was enacted in 1986 and they provide protection not only for their ships, but for German U-boats in the same waters.
As Captain Bender has found, you could go to the same geographic area, and you'd have protection for the Royal Navy ships, you'd have protection for the German U-boats, and a Canadian ship sitting right beside it does not have any of those protections.