Oh, having said that this very morning DS has suddenly decided to use the potty. First ever wee on it has been swiftly followed by two more and no 'accidents' as yet. Ho hum.
Having a potty about (used or unused) is always a good thing IMHO.
I see potty training achieving continence as a normal part of development, just like walking, crawling or speaking - some DC want / are able to exercise control over their bodily functions earlier and some later.
If we give them the means, in case of continence, information, naked time (when it suits us or they ask) and access to a potty or in the case of walking freedom of movement and a floor, they'll do it in their own time without training. Just like they do with any other aspect of development.
We don't say "sorry DC, you're only 10 months, no way are you allowed to walk yet" and strap them down until their first birthday or "right DC, you're 18 months now, time to walk, we're not leaving the house again until you can".
Get him a potty, talk to him about continence, let him see the rest of the family use the loo and see what happens. No pressure on him or you mind. If you get stressed about it hide the potty and 'forget' where it is and about naked time until you can hack him weeing all over stuff again 