Looks like a Spiraea japonica to me.

Thank you Shirley, son has been informed !!

Excellent. I have S. japonica 'Shirobana' and cut it back each Spring. It's probably about ten plus years old now.

Nick is just beginning to take a genuine interest in his garden which is so nice to see.

It must come with age Chris ... our son will be 40 in November and is finally showing some interest in his garden!