Hello!

Could someone please identify this flower for me please?
http://www.flickr.com/photo_zoom.gne?id=13444963&size=m

I took the picture yesterday on the banks of the River Aire at Kirkstall Abbey, yesterday
afternoon.

I've tried google image search and come across an awful lot of yellow flowers but nothing
that quite matches this one.

I'm sure it's quite a common flower (?) but I cannot match it to another picture on the
web.

Someone said to me that it's a Buttercup but the only Buttercups that I know and love have
more circular and shiny petals. Or is this just a different variety?

Maybe I'm not looking hard enough!?

Thanks in advance.

--
Banana
aka Paul
aka Bat 'n' Ball
http://www.flickr.com/photos/bat-n-ball/