Plant identification help please!
 

Hello,

Can anyone please help me identify a plant that has shot up in my garden?

It is about 4.5 feet high and has recently begun to put out flower buds.
It is in a bright East facing corner in Surrey.

Some pictures can be found he

http://www.stuhawkes.pwp.blueyonder....t/DSCN2879.jpg
http://www.stuhawkes.pwp.blueyonder....t/DSCN2880.jpg
http://www.stuhawkes.pwp.blueyonder....t/DSCN2881.jpg

I would be very grateful to find out what it is, as it has been a
challenge for weeks to find it in a book anywhere but I have so far failed!

Thanks,

Stuart