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From memory (and it's hazy since I think I did the SA in 2008 and 2011 ) there was the petrol station / truckers area when you first cycled into Membury via the access road, which had its own shop but hardly any area to sit/wait. But if you cycled on to the main services building you could stick your bike inside and then up the stairs (or was it a turned off escalator?) to the cafe area which has said manky carpet.
Chepstow Tesco! That brings back memories of two Severn Across rides. My first (and second) 400 and always enjoyed it. Also trying to grab any amount of sleep on the grim carpet upstairs at Membury Services.
400 was a huge step up from 300 given my relative lack of speed and ensuing sleep issues. I remember being very sleepy on a section near Reading and being perked up by dawn coffee from a garage somewhere.