By Windy64
Cambridgeshire,
United Kingdom 
Hi everyone hope your all ok ;-) ive got a little i.d for you, i would have pulled this up thinking it was some sort of holly until the flowers appeared, now i love it, big thanks. windy.
26 Mar, 2014
Answers
I've just spent 10 minutes looking it up in my book only to be beaten by you Feverfiew! I concur that it is Mahonia.
26 Mar, 2014
Aren't you glad you didn't pull it up? :-)
27 Mar, 2014
Most have the bonus of a lovely scent too.
28 Mar, 2014
Great contrast of dark foliage and bright flowers. Definitely a keeper!
28 Mar, 2014
Mahonia aquifolium. I quite like it too & have one in my front garden grown from a seedling. This year it has produced a lot of flower, only a few in previous early years.
26 Mar, 2014