Yet another unknown bush!

I am determined to identify all the plants in my garden, some of which were here when I moved in nearly 20 years ago so hope you don't mind me posting another mystery plant. There were three or four of these in the garden when I moved in but this is the last survivor so want to know how to look after it. This one is growing around a bay tree. There is a purple/pink phlox just to the right of it. The foliage changes colour several times a year and it has pink delicate flowers on it at the moment.

 

Possibly a spirea

 

Thank you so much - yes I think you are right! Found an image of Spirea Britannica and it looks just like that. Hope to now be able to give it some TLC.