This evening there was a train from London Victoria to Southampton Central, Bognor Regis and Redhill. All 12 coaches travelled to Redhill, where the rear 4 detached and went ECS. The front 8 continued to Horsham where the train divided again. Then the front 4 coaches went to Southampton Central, and what had been the middle 4 on departure from Victoria became the Bognor Regis portion. I think it went to plan, except the extra split delayed it...
(First split is not shown on RTT, but was the cause of the delay at Redhill:
http://www.realtimetrains.co.uk/train/W71290/2016/11/10/advanced )
Announcing this sort of thing is a pain on Electrostars, principally because the train cannot display coach numbers without a pre-set PIS code being entered, and of course the rarer "splits" don't necessarily have PIS codes at all, or only bodge jobs! Being able to reel off the calling pattern and split points professionally and not getting in a muddle is quite satisfying (even if you pre-plan what you're going to say, it's hard enough!), but having to manually explain how people should actually position themselves in the train is a nuisance, if there are no automatic numbers for reference!