Sounds like they've been more than fair, hope you get it back on the road asap.
Sounds like they've been no more than fair, actually:
1. Sale of Goods Act has been superseded do it would've been pointless trying to claim against that.
2. Consumer Rights Act would entitle you to claim defect or fault and ask for a fix or refund or replacement, which they have offered knowing they would have to do so.
3. A lot of places wouldn't offer such by default, they would try it on and then fold if challenged. This makes those places dishonest but it doesn't make
Decathlon amazing, they're just doing what they know they've got to do.