Just an update and to say thanks again for all the vibes and advice.
My Son is feeling much better.....he has had his specialist appointment and a follow up to that 6 weeks later. His back is healing on its own, thankfully no operation is needed. The specialist is happy with him and his back he has followed all the advice given and slowly and surely things are healing on their own, he has followed a gentle exercise regime and stuck with it and gradually upped it. Thanks Jan for the swimming idea, its been a good help both physically and mentally. He swims, walks, gentle jogs even now and rides his bike again. He did sadly lose his job but he used this as a chance to take stock. He as now moved out of London to Norfolk. New home and new life, there seems a fair bit of work there for him, some may be seasonal but he has no worries as such and we know he will be able to manage.
Thanks again everyone.