Ow far was Maragaret Thatcher to blame for her downfall?

This is a politics coursework OCR. I need someone to guarantee me a B and make sure that I do not get caught cheating as that would be the last thing I want. I would like a lot of Counter referencing and cross referencing with good analysis at the end of it with a strong intro and conclusion. I am not the best student so extraordinarily long words or difficult structure would be better if they were a little subtle (whilst still getting me a good B).
Sir Alan Walters Obituary