On Wednesday, I took my old(er) Tudor Heritage Ranger (the 41mm one) into the retailer I bought it from to have them send it for service (I've had it for about 8 years).

As part of that, they told me that I should (must!) remove the third-party watch strap it was on (sending in the watch-head only), because if that strap were present the Tudor service centre would:

1) refuse to service it at all; or
2) insist on destroying the non-Tudor strap; and
3) replace it with a Tudor strap they...

Brands (particularly, Tudor) being 'precious' about watch straps.