Grey Dagger Moth
A fairly common caterpillar in Cheshire in September in 2013. Moth found in Middlewich in Chreshire in mid July 2015. Attracted to light.
The caterpillars are completely different, but moth cannot be told from the Dark Dagger Acronicta tridens without close examination. Because of this I can only say that this is likely to be a Grey Dagger Moth as this species, partly because it has a slightly later flight season than the Dark Dagger.. Also seen in early August 2015.