1. It was luck as they could have chosen to repair it instead.
2. The Sale of Goods Act says that the contract is with the dealer, not the distributor or manufacturer. A manufacturer's warranty is a selling point, no more
3. Unlike you I actually check my facts before challenging what people write:
http://www.which.co.uk/consumer-rights/regulation/sale-of-goods-act
Ignore the fact the law he been amended - the 6 year bit has been there since 2006.
4. Rukka specifically sells the fact that they have a no quibble warranty and certainly on the trousers the quibbled, botched the repair then absolved themselves of responsibility. I actually got the replacement from Tran Am.
So your point is what exactly?