I have received a reply from admissions.
They basically did not answer my question as to why i was rejected.
'Unfortunately, on this occasion, competition for places on the programme was extremely high and the Admissions Tutor felt that your application was not as strong as your peers. Your application was more geared for studying Medicine than Medical Biosciences. This meant that the motivation to study Medical Biosciences was not evident. We would suggest that you make your motivation to study Medical Biosciences more clear.
Please note that the Admissions cycle has now finished, and we will not be able to provide further feedback.'
For the record my application was geared towards Medical Biosciences and on multiple occasions I highlighted my intent to study it. I just believe that the volume of applications this year was too high and they had to reject all other students once spaces filled up despite how competitive the application was. Hope this response helps anyone ^^