I am returning home from Hampden Park. Unfortunately I had just missed a London train from the Southbound platform, and there is nothing from the northbound platform to Lewes in the coming half an hour so I went to Eastbourne (on a 377 to Hastings) for a double back I saw a Brighton service passed through me non-stop to Eastbourne and it also wouldn't stop when coming out. The next service from Eastbourne to Lewes is a London train so I took it to Lewes and waited for another Brighton train. Unfortunately it's again another 377.
I saw a 313 in the opposite direction to Seaford while waiting at Lewes.
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The final chance for me today will be the westbound train from Brighton. Although 313s don't go to Southampton I'll take the first available train in the correct direction and change when necessary, so it's still possible to take a 313 if I end up on a Hove or Bognor Regis train from Brighton.