My kids and I had applied for our PR cards renewal and we got a residential questionnaire. I received mine first and my childrens' got delivered on a later date. I got it from the Windsor office and my children got it from the London office and because of that I'm supposed to hand over my questionnaire to Windsor office whereas my childrens' supposed be submitted to the London office. Why is that? Should I ask for Immigration file notes from the office and if so, where should I ask?