Tempting but early
The plan was a reasonable one. To get to Waverley to catch a train to London without leaving a bike in Edinburgh and a car at the airport for two days and without leaving a car stranded at Inverkeithing for two days. The solution - catch the early and only bus from the village to Inverkeithing and the train to Waverley. Never mind that that would mean arriving in Edinburgh two hours before the London train. It's a first class ticket and there's a first class lounge. Get some work done and then catch up with a wee snooze somewhere between York and Doncaster.
By Waverley it's all unravelled. It's the wrong kind of first class ticket. No, you don't want one of your advance firsts, you want an open first. That'll get you into the lounge. An advance first only gets you the same shit bacon roll and a tepid flat white at Costa, with everyone else sitting on some cold metal garden furniture. For £5.15.