Thank you Manxman.
So I'm just back from the consultation at the fracture clinic of my local Hospital. My son recieved a harder brace (which he must take off at night) and told "there is no fracture, the problem is radiologists see scans but do not examine the patient so misdiagnose, I will order the MRI images from Guy's and see you in 2 weeks. he has osgood schlatter disease".
I have never heard of that disease until today so am reading about it now. My son is not convinced, but I, so far, hope the Dr is correct as this condition apparently never returns after the age of 14 and requires no surgery.
I was originaly waiting for a G.P appointment but my son is in so much we decided to take him to a different A&E. For some reason that just feels wrong but what do I do when my son is holding a picture of his x-ray saying, dad, that is not a sprain, I am in agony etc. Thanks for your replies and I appreciate any thoughts