5 Fractions of Pelvic SABR With Intra Prostatic SABR Boost:

Inclusion Criteria * Histologically confirmed prostate adenocarcinoma (centrally reviewed) * High-intermediate risk defined as two or more of: T2c, Gleason 7 OR PSA 10-20ng/ml, * High-risk prostate cancer, defined as at least one of: T3, Gleason 8-10, OR PSA \> 20 ng/mL * Willing to give informed consent to participate in this clinical trial * Able and willing to complete EPIC, PORPUS and EQ-5D questionnaires Exclusion Criteria * Prior pelvic radiotherapy * Contraindication to radical prostate radiotherapy e.g. connective tissue disease or inflammatory bowel disease * Anticoagulation medication (if unsafe to discontinue for fiducial insertion) * Diagnosis of bleeding diathesis * Poor baseline urinary function defined as International Prostate Symptom Score (IPSS) \>20 * Evidence of castrate resistance (defined as PSA \< 3 ng/ml while testosterone is \< 0.7nmol/l. Patients could have been on combined androgen blockade but are excluded if this was started due to PSA progression. * Definitive extrapelvic nodal or distant metastatic disease on staging investigations. * Hip prosthesis