I thought that the point in using 387s is so that SDO can be implemented before the Class 700/0s turn up.
Correct, however the three services concerned are already 8 cars long - but formed with class 317s which have considerably more seats. Unless they go to 3x387, which doesn't seem to be on the table, it's a reduction in capacity.
It will also cause a problem replacing 2x317 with 2x387 on the morning Peterborough working, as this particular service is one of the busier up trains formed of 8 cars. We're not talking about leaving people behind, but these services are normally all seats taken (including the middle seats!) with various levels of standing depending on location in the train.
Aside from the reduction in number of seats, are there any other complaints?
Yes - the hard seats. The seating on the earlier variants of Electrostar is much nicer. Also the first class is in a sub-optimal location too. My local paper has two letters about the seating this week - not bad considering they're currently on just one diagram!
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I'd be grateful if anyone can confirm if the 7.06 ex PBO is going to be a 387 on Tuesday (1 Nov)?
Unless something else has gone wrong, there's no reason why not. The evening working (1823 KX to Cambridge) comes in from Hornsey Depot, so that should get the 387s into position without needing any special arrangements.
It's smacks of really sloppy operation that GTR couldn't get their stock balance at Peterborough right for the start of traffic this morning.