Isn't the plant in the photo the Hottentot Fig, which is classified as an invasive species and should not be planted in the UK (although it won't survive the winter up here in Tayside)?
I live in Spain and we have them growing here and they aren't too much of a problem to control. In fact they're used in large beds in some public gardens.
If I ever return to UK (which would probably be in a box), I'll remember your advice.
20 deg C and cloudless here today by the way. Spent a pleasant half hour pruning one of my bigger Oleanders :-)