National Express have been running a London Victoria-Stansted coach for years - the walk-up one way price has been £10 for the last few years. Greenline have wanted £17 for a one-way walk-up fare for London-Luton
Suddenly, Greenline decide they can offer London-Luton for £10 as well.
Sounds to me like a bit of competition has finally stopped a monopolist overcharging.