Also worth noting that the traditional start of the harvest in Kent is the Tuesday after the Summer bank holiday - but some of the Goldings clones in particular are early ripening, like Amos' Early Bird. I see Hukins started on Thursday.
But the harvest goes on for the whole of September, so you probably shouldn't be harvesting yet. As a rough guide, don't even think about it until there's at least one or two cones starting to have the odd brown "leaf" in the cone - like with any fruit it's a fine line, you want them as ripe as possible to maximise the flavour, but just before they start to go "off".