A lovely shrub, needs a prune, but what is it?

A lovely shrub, needs a prune, but what is it?

Observation - A lovely shrub, needs a prune, but what is it?. Description: This shrub is in my garden in rural Somerset and has just started to sag under the weight of its own branches. It looks like the leaves are going to turn a terrific yellow then red colour quite soon. I'd love to give it a name which would help me to look

This shrub is in my garden in rural Somerset and has just started to sag under the weight of its own branches. It looks like the leaves are going to turn a terrific yellow then red colour quite soon. I'd love to give it a name which would help me to look after it a bit better in future. Thanks for your help.