Leucistic starling in the garden

Imagine this, you watch the small starling flock at the end of the garden every day for weeks hoping for a rose-coloured starling in an invasion year, and you get to know every bird individually, then suddenly a leucistic starling turns up out of the blue and after you recover from the shock you wonder, is it leucistic common or might it be leucistic rose-coloured? It's common the bill shape is wrong for rose-coloured. Cracking bird though. A dead cert for the Pennington Flash starling roost I would have thought.