Inclusion Criteria:  Male or female subject aged between 18 years and 80 years Give written informed consent prior to participation in the study including all procedures Comply with study protocol requirements Able to read, comprehend, and write at a sufficient level to complete study related materials Able to complete the study and all measurements All patients have been through a severe asthma protocol that have ascertained the diagnosis of severe asthma, maximised treatments and ensured adherence to therapy. Stable asthma therapy for at least a month before screening  Exclusion Criteria:  As a result of medical interview, physical examination or screening investigation the investigators consider the subject unfit either because of risk to the subject due to the study or the influence this may have on the study results. A history of recreational drug use or allergy which in the opinion of the investigators contraindicates their participation. Participation within 3 months in any a trial testing a new molecular entity or drug. Those, in the opinion of the investigator, who may prove non-compliant with study procedures. Within 4 weeks of screening visit been hospitalized or required high dose oral corticosteroid (>30 mg prednisolone per day) therapy, asthma not been stable. Patients who have had prior treatment with bronchial thermoplasty, defined as completion of all thermoplasty treatment sessions within 6 months of screening History of significant pulmonary disease other than severe asthma. History of pulmonary eosinophilic syndrome or hyper eosinophilic syndrome. History of bronchopulmonary aspergillosis