Can anybody help identify this flower?

looks like one of the Ligularia species. was it tall and happy in dampish soil?

Thanks for your reply. I had wondered whether it might be a Ligularia as it has a pretty distinctive flowerhead, but the leaves were serrated. It was very tall. It was in a raised border in full sun, so the soil wasn't particularly damp.

It was indeed a ligularia x palmatiloba: I've found a match!

Well done Sbg, one happy customer! Pleased for you Mariannewil, nothing like hindsight/regrets!