About 30mm long, crawling on path (the leaf it is on is unlikely to be the foodplant)
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Impressive caterpillar, at first glance I thought it might be one of the 'Wainscots'(Mythimna) but havent been able to match it exactly with the examples in ukleps.
Can you link any images of the Double Lobed larva? I couldnt find any for reference.
Sorry, haven't got any links but used Jim Porters' 'Colour identification guide to Caterpillars of the British Isles'.
Cheers anyway Andy, I could use a copy of that.
Apamea of course, I knew that spot pattern was familiar but couldnt figure out why I couldnt find it on any of Mythimna species. I was on the wrong genus, its from having seen the larvae of Dark Arches and maybe Light Arches also on iSpot that I recognise the spot pattern. The prothoracic plate on the above larva sent me looking at Mythimna larva- its a bit similar. I still havent seen the Double Lobed larva but would love to- you are probably spot on Andy.
Lat/Lng: 51.4765, -2.57671
OS grid ref: ST600754