A mum is calling on the government to change its rules around Blue Badges after an application on behalf of her disabled twins was turned down. Sarah Johnson’s two-year-old daughters were diagnosed with cerebral palsy last July and struggle to walk. Astrid uses a Kaye Walker but Iris chooses to walk independently, which means she falls over a lot and can only walk a few steps at a time. When Sarah, of Rhodendron Avenue, Meopham, applied to Kent County Council for a blue badge she was told she did not meet the criteria and would need to wait until November, when the girls are three, before they…