I'm not saying he can put them in the bin (why would he do that?) but if it's registered land (as I
specifically said above) then the land registry will hold the required documents for him to prove his title.
Obviously if it's unregistered land and you need to prove the title then you'll need the documents (as I also inferred above).
And you've selectively misquoted me too (please don't do that) when I was referring to my own house (being registered land) in terms of 'everything being electronically stored' and that I am therefore 'not worried' about having any documents at all. As I said above if the property is registered with the land registry then it is registered with the land registry and that at the end of the day is all you need to really be worried about.