Colouration in photo is not due to glare, hairs were silver with some orange tufts.
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I'm not familiar with the grass eggar larva, at first glance this appeared to me to be a silvery Oak/Northern Eggar, its very much like one. Its quite different to the Fox moth larva, I'd definitely go with an Eggar of some sort.
Cheers for your reply Cathal, i ended up sending the image to the local vc recorder who is certain it is an Oak Eggar, it looked too silvery to me and i was hoping for something scarce i guess!
Yeah it really looks like an Oak Eggar/ Northern Eggar, I havent actually seen one as silver myself, its very interesting. Its the Northern Eggar I see on the hills around me here in Co Antrim, I viewed 4 or 5 big mature ones today, all rich reddish brown and beautifully marked. About the size of my index finger, they must be close to pupating.
Apparently they enjoy a good bit of sun basking this time of year, though as you can probably gather from the pic it's more like they are out for a shower!
Lat/Lng: 53.6, -2.6
OS grid ref: SD6612