We're scheduled to arrive at 12:10 from the US on Aer Lingus (via Dublin) on a Sunday afternoon in June. My understanding is that we'll go immigration in DUB and will only have to clear customs at LGW? And from what I've read on these forums, customs alone is usually a pretty quick process? We will have checked luggage. So what's a reasonable guess as to what time we'll be able to board a First Capital Connect train toward Central London?