Injured or old crow/raven? N11 London

I found this guy the side of a busy footpath (predestrians/dog walkers/cyclist).  He wasn't flying or walking, but he is alive and moving his wings a bit.  He might just be old but I don't want him to be accidently hit (or eaten...)  The box has a lid on it and is in my quiet bathroom for now.  Anyone have any suggestions as to how to make him more comfortable or anywhere I can take him if he starts to recover a bit?