Setaceous Hebrew Character (Xestia c-nigrum)
This species breeds here with some larvae surviving the winter and the first brood emerge in April and May but the numbers are topped up by inward migration from Europe. The eggs of the first brood start to emerge in August and second brood insects will occur right through until October when the colder night will then see them off.
It is easy to see where the 'Hebrew Character' comes from with the distinctive marking on the fore wing but 'setaceous' means having a bristle like appendage according to my dictionary. but I cannot see a bristle like appendage on this specimen!
There is a moth just called the Hebrew Character. Whilst similar, It is a little bit larger and tends to be around a little earlier in March and April.