Although not an unknown move, certainly quite rare in this case, XC 1V52 0600 GlasgowPaignton was running 31 minutes late and the south coast line between Exeter and Newton Abbot had gotten very busy, so the signaller used the infrastructure appropriately utilising the bidirectional running on the up main to allow regulation for the on time GWR HST express 1C84 1306 PaddingtonPenzance. I was just fortunate to be filming it all at the time.