Ealing Broadway is always busy so I think you would stand a better chance of help there than Ealing Common. This step-free guide to the tube may help if you have not seen it before: https://tfl.gov.uk/cdn/static/cms/do...-guide-map.pdf and here you will find the Avoiding Stairs Tube Guide: https://tfl.gov.uk/forms/12387.aspx amongst others.