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this doesn't look like dock - might it be rhubarb?
But I couldn't say what species.
OK - certainly a luxurious leaf.
I asked because here (Orkney) they seem to have taken to rhubarb towards the end of the season - around October. I am not entirely certain whether the larvae eat the leaves but the adults seem to nibble holes.
Lat/Lng: 54.564, -5.929
OS grid ref: NW461258