When we return on Eurostar what happens?

[paranoidmother]

We're coming back on Eurostar into London about 9.20pm at night from Disney.

When we get off do we just get off, collect luggage and leave or do we have to do anything like customs or is there anything else that would take up time?

Does anyone know? We're trying to work out which train to get home on after that and want to work out timings.

TIA

you just get off the train like a normal train. And then leave the station. Am pretty sure customs are in france (ie when boarding).
I'd be vary of booking trains though as the eurostar can be delayed

You will go through the customs and UK passport control side in France before you board the train. When you arrive back at St Pancras you leave the train with your luggage, there are no other formalities.