Okay, so I went for my results today and I promised myself that I would come back and update this thread for anyone else who is driving themselves crazy looking for answers.
My results were that my tumour was 'borderline' which means that there were changes in cells, but hadn't become malignant. Ultimately my tumour had grown to 7cm by the time I had surgery and with large lumps like this different parts can produce different results.
Mine has turned out to be a phyllodes tumour, which was predicted before surgery due to my age, 47 and the fact that it was rather large.
Ultimately nothing you read on any of the forums will put your mind at rest until you get your individual results (at least it didn't for me), but having been told that mine was suspicious for high grade cancer and it turning out to be 'borderline' shows how things can turn out differently from original findings on mammogram and ultrasound.
Much love to everyone going through the rollercoaster ride of awaiting results.