Hi -
If he has had all these stories, audio books in the car, and even when he is doing Lego (which, I would have thought, needs quiet for full concentration!) may be it is just an EXCESS of books and stories that has filled his life, and now he has now decided he's had enough of it! At 11, he is not far off teenage, and teen attitudes, difficulties and confusions may be starting to kick in.
As he can read well, and hopefully with adequate understanding, does it really MATTER that he doesn't choose to read much? Provided his reading and comprehension is sufficient for SATs, (I assume he is Yr6?) then personally I would leave him alone.
Liking sport, is he not tempted to read sporting books? Or books on science, space, technology etc.
Our DS liked computers when he was 5, and by 6 was starting to write programs. Twenty-five or thirty years ago computers were primitive enough for amateurs to easily learn programming. In fact DS, now aged 30 and at home with us for a week, has just found a PacMan game he programmed on his 'scientific calculator' at grammar school, and IT STILL WORKS! Now he hopes to get it off and get it on to the 'web'!
There is a £25 computer, the Raspberry Pi, that needs a keyboard and can plug into a TV or other monitor, that he could teach himself programming on. MAKING your own computer game can be even more fun than playing ready made ones!
(I'll come back tomorrow to see how this 'thread' is progressing, and if appropriate, send you more info on Raspberry Pi.)