Brian.
I find spiders pretty confusing n all, and Venger (gawd bless 'im) is doing his best to educate me/us on our arachnid friends.
I'm going to stick my neck out with your spider, and then be told (probably by Venger himself!) that I'm completely wrong.
But... lets have a stab at:
Zygiella x-notata (the "missing sector orb weaver")
Your spider looks very like
Words' (and mine) recent IDs on this forum a week or so ago.
But these orb weavers with their leaf shaped mark on their abdomen are confusing (to me anyway).
Anyway. Thats my guess....
Zygiella x-notata
Apologies if I'm wrong!
Doug