Here the duty of care is imposed on the basis that the defendant has a right or responsibility to control the third party and, in addition, that the claimant is someone at particular risk of damage over and above the public at large. The clearest illustration of this is Home Office v Dorset Yacht Co [1970] in which the defendants were held liable for the wrongful acts of some borstal boys under their supervision. Carmarthenshire County Council v Lewis (above) provides a further illustration.