So... I am due to return to work before Christmas and wanted to be organised in finding childcare. DS went for his first visit yesterday morning and I went in with him, he was one of two babies in the baby room, supervised by one member of staff which is fine. The nursery owner/leader asked if I would like to leave him for an hour to see how he settles.
I leave and return in one hour as agreed, when I arrived a lady said he'd had a bump. Going back into the baby room I see the other baby is asleep and DS was being held and cuddled with a cold cloth on his head. When looking he had a large bump that went from him eyebrow to 3/4 of the way up his forehead. His eye was starting to look puffy and he was screaming.
Apparently he was pulling himself up onto the table which had a tablecloth on it and the tablecloth had slid off as he grabbed it and he hit his head on the table. I calmed him and we left, he fell asleep on the short walk home and I left him to sleep. Upon waking he was sick and generally quite groggy. Very quiet and unlike his singy shouty self. I called DH to come home and take us to the GP to get him checked, whilst waiting he was sick again and seeming tired even though he had not long slept.
We took him straight to A&E where the doctor said he was quite clearly concussed and for us to look out for more vomiting or fits. He didn't get worse upon returning home and is recovering well with his bump on his head and his black eye 
Now I know all kids have falls and bumps and scrapes, my 8 year old certainly has, but if he was the only baby they were looking after then I am struggling to understand how this has happened. 
Needless to say the search for a nursery continues....