"With easy access to central London, Cambridge, Stansted Airport ..."
Let's get this straight. Perhaps the most unreliable rail link I've ever used is between Norwich/Ipswich and London Liverpool Street. The A14 up to Cambridge is a race track ona good day, and a virtual car park whenever there's an accident (how many times a week?). There's no direct way to Stansted, except by driving the hour and a bit down the A12 and (admittedly much-improved A120).
Not a great selling point.