The next stage of the assessment (this may be a further appointment (visit 2) if the initial assessment was not carried out a QAH) will take place at Queen Alexandra Hospital where the space is available to carry out the assessments. Transport can be provided to this venue if required. Consent will first be obtained and participants will then complete the first of two walking test for 6 minutes to measure how far they can walk, known as the six-minute walking test . Oxygen levels will be measured using a probe that fits on the finger and if significant oxygen desaturation is noted, the participant will be withdrawn from the study and referred onto the local oxygen assessment centre. The participant will be asked to fill out four health- related questionnaires and they will then repeat the six minute walking test and the best of the two tests will be recorded.