Outprice even CrossCountry. They also think passengers dislike Lumo's capacity issues and the busy feel onboard. Everyone gets a seat however so that's very nitpicky imo. It can be a tad annoying upon boarding but after you're sat down it don't matter.

Mandatory, to make sure that while yes the train is busy everyone is able to sit down. If you're left standing on a Lumo service (when there's no distruption), you've intentionally booked a service with no seats avaliable. They make you aware of that before payment. – at Washington, England