Thanks Graham,
funny you should mention Garden Tiger. I was in the Lee Valley Ranger office this afternoon when the same friend brought in a Garden Tiger moth, deceased. He said it was alive when he found it, at Gunpowder Park just south of Waltham Abbey town. These are probably still resident in the valley but its ages since I did any moth trapping. I noticed an old record of a caterpillar I found at Walthamstow Marshes (05/06/99) today and I used to get occasionals in the moth trap at Essex Filter Beds, eg 1 on 15/08/96; 26/07/97
Regards, Dave