Hi Matt, I've just looked it up in my RHS Plants and Flowers book and it looks like it is Corylopsis gabrescens - so well done Cambridge Rose and Silver Surfer. Not one I've seen in the flesh so to speak and it does look lovely from your photos. Lucky you!
then it is a winterhazel, Corylopsis sinensis, and not a common hazel, Corylus avellana. The winterhazel will die if coppiced. Instead, to keep it within reasonable size, cut out one-third of the oldest growth after flowering, and feed and mulch well. Then repeat the following two years, taking out the oldest third each time. However, Corylopsis are very beautiful and flower on mature wood, so you might not want to be that harsh with it
they are tighter catkins with a kind of granular appearance on the outside.
Cannot tell which one from pics.
Related to Hamamelis... in Hamamelidaceae
Corylopsis are very underrated shrubs...in spring they are fab.
In my humble opinion much nicer than Forsythia.