Not reliably hardy in colder areas of Britain, but provided with a sheltered, warm spot in soil that does not completely dry out, they do survive.

http://www.growsonyou.com/shop/product/32406

Have a look here.

I lost my Leotisoermum scoparium `Red Damask` due to this years very bad frosts, it was three years old and planted near a 6ft fence on a West Facing Wall in my back garden which is South Facing.
Hope this helps.