Inclusion Criteria:  Patient capable of providing informed consent Female Have a diagnosis of invasive breast cancer or ductal carcinoma in-situ Have been discussed within the multidisciplinary meeting with a recommendation that the patient is suitable for breast conservation therapy Any localisation technique can be used of impalpable lesions (eg if the wire impairs the image quality, this will inform for full scale research) Patient undergoing breast conservation surgery Patient undergoing further breast conservation surgery for positive margins after previous surgery Patient's will be able to participate for a re-excision of margin, even if they did not participate for their initial operation  Exclusion Criteria:  Patient undergoing mastectomy, including completion mastectomy due to involved margins  Patients undergoing excision biopsies Male patients Patients under the age of 18 Unable to provide valid consent in English language