Ahh, that's a lot better. I think it's Polygonum persicaria... A quick
websearch for that has brought up this page:
http://www.hawriverprogram.org/NCPla...aria_page.html

It's a fairly common weed, bit it's quite a charming plant.


Yes that looks like the one to me. The site says "The plant grows in moist
areas of waste ground and disturbed sites." Should be quite at home then. I
think I'll thin them out before they take over. As colin says they are
charming so I'll keep a few.

Many Thanks to all who took the trouble to help out.

Jus