You may be entitled to a Blue Badge if you find walking difficult or are caring for a child who cannot walk far because of their lung condition. There is useful information here: www.citizensadvice.org.uk/benefits/sick-or-disabled-people-and-carers/help-for-disabled-travellers1/blue-badge-scheme/applying-for-a-blue-badge/. In addition, you can review the eligibility criteria and process for applying for a blue badge on the government website here.