Participants will be screened for their nutritional health and tailored advice and education will be provided on an individualised basis. An online dietary recall tool will be used to track patients' dietary habits. This will occur from diagnosis until point of surgery and recommence for 6 weeks post-surgery once deemed physically fit.

Participants will sit on a chair (height 43-45 cm) with arms crossed on their, and legs flat on the floor, parallel to each other, and approximately shoulder width apart. Participants will stand up and sit down 10 times as quickly as possible. Participants must not bounce off the chair when moving from a seated position to standing position. They must fully extend their legs on each stand. The time taken to perform 10 repetitions will be timed using a stopwatch. Participants will perform two trials and the best trial will be recorded as their score.

Participants will be instructed to wear the device on the midpoint of the anterior aspect of the right thigh and attach using a film adhesive frame dressing. They will continue to wear this for three days continuously. They cannot wear the ActivPAL3 triaxial accelerometer during water activity periods.

NCCN Distress Thermometer: To detect distress (psychosocial stress) with all stages of cancer. This is measured using a visual analogue scale like a thermometer to indicate a range from 0 (not loaded) to 10 (extreme pressure). Additional 36 items in five problem areas - practical family, emotional, spiritual, physical, are rated for distress and a score of 5 or higher is considered significant stress.

This is a self-report measure of traumatic stress symptoms focused on intrusive thoughts and avoidant behaviours. Questions will be adapted to reflect the PM diagnosis specifically. Frequency of symptoms will be self-reported during the previous week using a 4 point scale from 0 (not at all) to 5 (often). Total scores range from 0 to 75 with higher scores indicative of greater cancer-related stress. Scores in the range of > 30 are reflective of clinically significant stress. Higher scores on an adapted IES are related to decreased immune function in breast cancer patients.

This questionnaire is a semi-structured interview with the patients that measures reserve in three parts: Education; Working-Activity, and Leisure time. Each sub-scale and total index score is correlated with age and expressed on a standardised scale.

The Functional Assessment of Cancer Therapy- Cognition is a self-report 37 item questionnaire that assesses cancer related cognitive problems. Sub-scales include: Perceived cognitive impairments, impact of perceived cognitive impairments on QoL, Comments from others and perceived cognitive abilities.

This is a 12 item Communication and Attitudinal Self-Efficacy scale for Cancer, and rates a patients' perceived ability to seek information, understand and engage in care, and maintain a positive attitude. Confidence level for each skill is rated on a 4 point scale with higher score indicative of higher self-efficacy.

This is a standardised and validated self-report measure describing health status. It is disease non-specific but applicable to cancer, with five dimensions (mobility, self-care, typical activities, pain, anxiety/depression) with three problem levels to rate (some to extremely problematic). The higher the index score, the higher the perceived health status.

This is a version of the Functional Assessment of Cancer Therapy is a 28-item self-report survey that measures quality of life; it has 5 sub-scales measures physical well-being (PWB), functional wellbeing (FWB), social/family wellbeing (SFWB), emotional wellbeing (EWB) and satisfaction with care. Self-ratings of all 5 subscales for the present moment and the preceding week are captured, computing an overall total score. Good Cronbach's for all five have been reported, and the higher the core the better the QoL.

The Malnutrition Screening Tool (MST) is an easy to administer tool. It is based on recent appetite and weight loss and has been previously validated for use with oncology patients. The measure scores both "recent intake" and "recent weight loss". A total score of >2 indicates a risk of malnutrition.

This measure of cancer prognosis is measured using serum markers CRP and Albumin. The score is used to measure the cancer prognosis. The score ranges from 0-2, with patients with a normal measure of CRP assigned a score of zero, and those with both elevated or reduced levels a score of 2.

Foodbook24 is a Web-based, dietary tool consisting of a 24-hour dietary recall and food frequency questionnaire. Patients will provide dietary recall information about what they have eaten in the past 24 hours.

Bloods should be ordered by clinician for Iron (Fe) analysis (identify anaemia) and CT scans of patients should be analysed for the identification of incidence of sarcopenia.

The Comprehensive Complication Index (CCI) sums all post-operative complications with their respective severities on a scale of 0 (no burden) to 100 (fatality).

Length of stay in hospital as a result of their operation.

An exploratory analysis will review healthcare resource use by individual participants and with locally determined unit cost calculate the healthcare cost related to the two interventions. The mean group difference in accumulated costs will be used in the cost-effectiveness analysis.

Biomarkers will be analysed on a sub-group (n=20) of recruited participants. Serological markers of inflammation using a multiplexed ELISA approach will be measured. The Luminex system can measure up to 45 serum cytokines and markers of inflammation, including the inflammatory cytokine IL-6, which has been associated with increased PS and PA. Inflammatory markers will be assessed at baseline, pre-surgery and post-surgery and 6 weeks post. Blood samples are taken routinely pre and post-surgery but for the purpose of the study the two additional timepoints of baseline/consent and 6 weeks post will also be taken. Using this dynamic approach, we will be able to correlate a patient's inflammatory response with their outcome during their prehabilitation and after surgery.

Patients will also be asked whether they consent to take part in a short semi-structured phone interview with a member of the research team across two timepoints: pre surgery and 6 weeks post. The interviewer will ask the patients exploratory questions relating to four main topics: 1) Participants experiences and engagement with their care pathway (both control and intervention) 2) Perceptions of their emotional and physical preparation before surgery 3) Perceptions of their condition pre and post-surgery 4)Perceptions of physical and emotional symptoms pre and post-surgery.

Participants will be asked for their smoking status. If participants are active smokers who would like to cease smoking, they will be provided with the National Centre for Smoking Cessation and Training information support packages.