Its Telekia Speciosa Kfunsters, fabulous perennial I have it in my garden too.

Oooh! I like that...does it prefer full sun or would it grow facing east - so sun for half the day?

It really doesn't like direct sun, i'm always having to water it as it wilts.
Simbad - is there a common name for the plant?

Heart-leaved Ox Eye is it's rather prosaic common name - Telekia speciosa is much better IMO :-)

thankyou folks now I know

Another name is Buphthalmum speciosum, but thats even more of a mouthful,lol, yes mine wilts badly too have it in a shady spot near the pond under some trees, just seems to get bigger every year read it can get to 8ft!!!!!

I have a much smaller Buphthalmum...B. salicifolium...that does need a sunny position, though.

I'll keep an eye open for this one!