Can anyone identify this plant?

http://www.admac.myzen.co.uk/plant/

Purchased last spring as a trailing plant suitable for a hanging basket.
During the summer it just put on a lot of foliage. Last Autumn, as it
was still green and thriving when the rest of the plants in the hanging
basket were long past their best I just left it. It has remained green
all Winter and has had lots of yellow/white flowers. It has survived
being encased in sheet ice (snow melt from the roof re-freezing during
the nights) Although it is also now past its best as a result of
buffeting from strong winds rather than the cold weather it is still
flowering. Total size of the one plant = 4 times the size of the 18”
basket. Photograph taken today (29 Jan 2011)

--
Alan
news2009 {at} admac {dot} myzen {dot} co {dot} uk