Hi Harrison,
No, there is no chance of purchasing these from the BBC, they were specially produced for Mr Lam and really a programme which is broadcast frequently between 10 a.m. and 11 a.m. in the morning on BBC1 TV programme called "City Hospital". Anyone who wants one, and wishes to do a copy is quite welcome to do so, there is a copy of floating around in the USA that people can copy and send to friends.
It doesn't actually show Mr Lam doing the surgery as such, it shows him discussing it with the patients, and also just the x-rays following the surgery. There is also a lot of other stuff about other people within the hospital which is nothing to do with Mr Lam or spine surgery. Mr Lam works in one of the world's most prestigious hospitals which is Guys in London, that is why this TV programme is so popular.
Best,
Alastair