Blocking access to houses by parking on double yellow lines

My nine year old son will be going into a wheelchair within the next month. When cars or vans park on the double yellow lines outside my house (no 4 Grecian Street), it is going to be impossible for me to get him out of the house. Not only could this impact his education when I can’t get him or his brother to school on time, this poses a serious health and safety risk. I will not be able to get him out of the house in case of emergency. The cars often park so close to the house, they knock into my wheelie bins that are outside. This leaves barely enough space for an able-bodied person to leave the house, let alone someone who is reliant on a wheelchair. Please can something be done urgently- this is a major source of anxiety for my son who needs a clear escape route. He is extremely anxious after a small house fire and is terrified I won’t be able to get him out of the house when he is in a wheelchair (which is anxiety-inducing enough).