Although it's not known, speculation points to a lack of maintenance rather than a manufacturer issue. It's an awful incident and thankfully no one was killed.
Victims probably won't get pay-outs anywhere near as high as the people on the smiler. Most people probably didn't even know M&D's existed and Alton's one of the biggest, most well known parks in the UK, so along with BREXIT and everything it's not really that surprising that the media hasn't covered it all that much.