Bracelet advice on Sub 6536/1

[nigelUK]

Spoke to a friend of mine earlier and the bracelet on his Sub has 'fallen apart'.

He is looking at the options but I suggested in the short term a nice NATO or a vintage leather strap.

Can you help me with the following;

* Is the lug width on this model 20 or 19mm ?
* Is there a newer (more robust) sub bracelet/endlink that would work with this
model ?
* Also, I believe there is someone in the UK that can work on bracelets ?

He isn't a WIS and my long term goal is that he will just sell it to me

thanks for your help in advance ..