Robin Barfoot, of the Essex Moth Group, has recently reported catching one at Woodford Green. Apparently he gets them every year nowadays as they have colonised parts of the London area. None have ventured as far as Ingatestone, though; indeed, I've only had one Garden Tiger locally in the past twenty years. I used to collect their "woolly bear" caterpillars and rear them when I was a kid; they were everywhere in those days. I could go on - one of the penalties of increasing age and a long memory!