It looks like a Tamarix.

Yes, tamarix. It can be grown in the UK - we had one in family garden in midlands - it was hardy but never really did much in the way of growing, don't recall it being much more than 4 ft high but very effective in good years with a froth of candyfloss pink wafting on the slightest breeze.

That sounds familiar, thanks guys :))

I have a tamarix Snoopdog, but don't know anything about pruning them. When should it be done & how much? Mine is only about 4/5 years old at the moment, but was nice and frothy this year.