Or you mistook what you saw on the webcam? Which is far, far more likely.
Of course it's possible for anyone to mistake what they see, but:
a) the trains definitely comprised four cars
b) the rearmost two cars looked too short to be 20m long 150s which the first two clearly were
c) RTT shows all local trains between the 07:14 1S39 XC service to almost 08:00 as either
2-car 150s or the one 0735 EXD to PLY as a 5-car 802.
I was looking at the Marine Parade Live camera and as far as i know it was all live as the two EXM - PGN and one PGN - EXM locals were roughly on time. I've been back on the webcam whilst answering thios thread and I can't see any facility for looking back alond the recent timeline (without a subscription) so I don't think that I accidently slipped into that. I might add that I had been awake and up for over an hour so presumably wasn't dreaming it.
But heigh ho, it is trivial in the big scheme of things. Thanks for the replies to all though. At least my assmption that 143s were not running around has been confirmed.