Only generic branded Chinese bikes would it be nearly impossible for a claim to be filed under the warranty provisions and expect some sort of satisfaction. The Raleigh bike in question is not a generic brand, Raleigh of USA will in fact honor the warranty if it's deemed to fall under the warranty provisions for frame failure. Trek (as well as a slew of other brands) have a lot of their bikes made in China and they have no problems honoring the warranties, just as Raleigh will have no problems honoring their warranty.

The biggest problem with warranties is whether or not it can be proven that the frame failed due to workmanship and or materials. If there is any evidence contrary to that then they won't cover the frame.