Thank you PLUMPUDDING, looked in my wildflower key and can confirm it is Pink Purslane. I now think I should leave it (but hope that's a good decision),and wonder whether this variety can be used along with our other salad leaves!

Thank you everyone. It has covered approx 10sq metres in the last week, in a bed with a tree canopy in which we planted ornamental grasses and creeping thymes last year. Creeping thymes have disappeared! We live in the Galloway hills overlooking the Solway.

This is growing with vigour a few yards away from our fruit/veg plots/raised beds and we cannot yet identify it, so worry whether it may have adverse effect. Any advice will be gratefully received: