Just spotted this. It's the only one like it among a clump. Very pretty I think..hope the rest decide to follow...
Maybe it will, maybe it won't, but the picture shows a superb example of the two types of primula flowers. The red one is 'thrum' eyed and the changed colour is 'pin' eyed. This means that they are on different plants since Primulas usually only produce the one kind of flower on each plant.
Just been and looked and can confirm it is on the same plant. The full coloured ones do show faint white patches.