G1 mucinous breast cancer

Hi all, my mum has recently been diagnosed with mucinous adenocarcinoma. It has been graded 1, around 2cm in size. We are waiting for a further tests, but I was wondering whether anyone one with the unfortunate experience, could share how long they have been waiting for the diagnosis, tests, treatment here in UK? Does it take long for the treatement to start (operation etc) after the initial diagnosis? Many thanks for any advice!