I think Prism were sold to National Express so you may well be right.
"WAGN" was an awful name, why make people think instantly of wagons?
West Anglia Great Northern - was it really an awful name? It described the network perfectly, unlike c2c. They don't even know what c2c means! Though when I lived in Highams Park for a short time as a kid, other kids always called it wagon!
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The empire of National Express was impressive. Midland Mainline, Central Trains, ScotRail, Silverlink, West Anglia Great Northern, c2c, Wales & Borders, Wessex Trains, "one" Railway. Then it all went hopelessly wrong....