It might be that the Macmillan nurse is allocated to his case by the hospital Bri, and that she does actually have access to his scans and test results. Some hospitals use macmillan to provide the clinical nurse specialist function.
Benjlt, the NHS is supposed to get treatment started within 31 days of deciding which treatment is best after a cancer diagnosis. But the 31 days is put to one side when the delay is because the patient is away or wishes to seek second opinions or an appointment date isn't convenient or whatever.
If you were a T3 it might be a bit more risky but with a T2a diagnosis, a couple of weeks isn't going to make much difference. The T score is only a guess anyway - like Bri, my husband was upgraded. He was diagnosed as T1 with a tumour so small it didn't even show on the scan. Once they operated it became clear that the whole prostate was affected and it had spread to his bladder. He had his op about 4 weeks after diagnosis but it hadn't spread in that 4 weeks. he was just unlucky.