There's a platform loop in the northbound direction at Penrith.
The speed differential is one reason why TPE services are always the last in the flight, preceded by the Trent Valley fast and the Brum.
You'd have to be running very late to impact the next flight.
You misunderstood me, but I probably didn't explain myself correctly.
My journey is Edinburgh-Lancaster and vice-versa, so I'll take either the Virgin or the TPE services: mostly the latter because they're cheaper, but sometimes the Virgin is just more convenient. But sometimes the Virgin (and it's only Brum ones for Edi) will be running late from before Wigan, and the TPE gets in ahead. This has happened to me a few times. When it did, we always went behind it at 100mph until Carlisle, where we tended to overtake them, although one time we didn't even get to do that due to lack of platform IIRC.
By the way, is there a procedure for doing this, where the signaller will tell the driver over radio that there's a slower train ahead and to adjust their speed, or does the driver have to guess this is the case from seeing double yellows when going at top speed?