Hi, just wondering how much time I should allow to get to check in at Eurostar having arrived at St. Pancras from Stratford International on a Southeastern service? It'll be me and the Mrs with two young kids (no pushchairs) plus a couple of rucksacks. I don't want to have to rush, but equally I don't want bored children running round the departure lounge! The 0858 departure from St.P for reference. Thanks in advance.