The information required is here :
http://www.caa.co.uk/srg/med/default.asp?page=540
Class 1 Requirements
Initial Class 1 certification may be possible provided that:
* There is a minimum period of 5 years since the last acute attack, and no significant hospital admissions
* Lung function tests are acceptable (the FEV1/FVC ratio should be greater than 70% with no appreciable drop after exercise)
* The asthma is well controlled on treatment with an inhaled steroid or cromoglycate, with or without an inhaled bronchodilator. Treatment with oral steroids is disqualifying
* There is no bronchospasm (wheeze) on examination
* There is no bronchospasm with a mild respiratory infection (e.g. common cold)
* A comprehensive report detailing the above is provided from a Consultant Chest Physician
Existing Class 1 certificate holders who develop asthma require similar evaluation and may be restricted to multi-crew duties.