Unknown moth - ID help please

 Unknown moth - ID help please

Observation - Unknown moth - ID help please. Description: We spotted this pretty little brown moth with its distinctive white wave while looking at Duke of Burgundys on Bison Hill, Whipsnade. It's probably very common but I cannot find a reference to it. Can anyone help please?

We spotted this pretty little brown moth with its distinctive white wave while looking at Duke of Burgundys on Bison Hill, Whipsnade. It's probably very common but I cannot find a reference to it. Can anyone help please?