The Romans were southern Europeans and thus genetically distinct from Celts, Saxons, and Normans, but I haven't seen much on the genetic "signature" of Romans in the British isles.
One of my classmates had maternal grandparents from England, and has just such a nose. I didn’t have any Italian DNA ID’ed when I had mine done, but had something like 30% Scandinavian, due to the big bad Vikings’ having settled, sacked, and raped their way through the Isles, Scotland, Ireland, and Britain. Oh, and German ancestry probably means some Scandinavian made it through.