Thanks everyone - I think JennyJ you could be right, as I googled Helianthus Lemon Queeen and I vaguely remember the flowers being like those, or similar anyway
Lemon Queen doesn't make 2 m here on the dry sandy soil (maybe 1.5 or a bit more in a good year, a bit less last year when it was so dry) but they have it at Harlow Carr where it's wetter and theirs are huge compared to mine. Plus the one in the picture looks as if it's in a pot, so wouldn't have reached its full potential.
Doncaster, South Yorkshire. Soil type: sandy, well-drained
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"We don't stop playing because we grow old; we grow old because we stop playing." - George Bernard Shaw
"We don't stop playing because we grow old; we grow old because we stop playing." - George Bernard Shaw