No, not in any way.
No, it is a mutual society hence not part of any other. check the website if you want further reaasurance
No - the Newcastle is a mutual building society owned by its members. It is not part of another bank or building society.
providing banking and other finance services
http://www.bsa.org.uk/difference_bank_bs.htm
The Chelsea building society which is based in the UK and whose primary business is to provide mortgages and savings is a mutual building society. It is owned by its members (savers and borrowers)...