Yellow Moth with Black V shaped spots

Yellow Moth with Black V shaped spots

Observation - Yellow Moth with Black V shaped spots - UK and Ireland. Description: I collected some caterpillars from Plymouth last summer and they pupated but didn't hatch until the date given. This is what emerged, any ideas as to what it is? I have only tried using two rudimentary picture guides I have available for its ID.

I collected some caterpillars from Plymouth last summer and they pupated but didn't hatch until the date given. This is what emerged, any ideas as to what it is? I have only tried using two rudimentary picture guides I have available for its ID.