Good luck.I am still a Civil Servant. They are increasingly pushing hard on the use of Advanced tickets (at least one way if the time of end of business is uncertain).
My finding was that there was little saving to be made on an advance ticket on the up 06:59 from Wilmslow to London anyway, and I wasn't prepared to hang around until the down 19:40 return on an advance ticket for the journey home to save money. But doubtless someone has been given an "incentive" to save money and spotted an opportunity here.