I managed to complete task 4 of visiting Burton Agnes Hall; arranging by phone an appointment to go and have a look around with permission to take pictures even though the hall was closed to the public. The staff felt that my reason for visiting the hall was reason enough to be granted access. Unfortunatley I could only access some of the ground floor due to an employer being on holiday who could disarm the alarms and was also better informed about the hall etc. I have been asked to book with him another visit in a few weeks to have a full tour and gets some more research done.
There is a link to the hall's website and the photo's I took for research above.