Hi,
There seems to have been more than one Hannoverian Hattorff in English barracks. A Sergeant has been mentioned and below is an officer; Captain G. Hattorf serving with the Earl of Uxbridge in the "Light Dragoons". I can tell you that soldiers had/have to make private arrangements for their wives and children and sometimes when the soldier is posted to a new barracks his family get left behind or go to their own parents homes until the soldier can make arrangements for his family to join him. My 3 children were all born in different towns - this is because my husband was in H.M. Forces. You need to find the soldier's army record which should include that he asked permission to marry. If this cannot be found there is always the official army diaries which details where the battalions and regiments were sent to.