I have taken more photos which are a bit clearer. There was only the one plant and the red colouring was only on flowers on one side of the bush. Maybe there is something unusual in the soil or the dry weather has caused the effect or else it is just a 'sport'
Nice find it is very unusual. It was hard to investigate as I didn't have gloves on but there are appears to be three separate shrubs the middle one with the red tips and two white ones either side.very close together.