A similar looking plant is pimpinella major rosea, but that's a plant for full sun and flowers a bit later ( here, anyway. Anything can happen at Chelsea of course.)
Thanks @Woodgreen - I have tried pimpinella major rosea but it never returned. I'm finding milk parsley returning and it seems to want to multiply, so I'm happy with that.
This is a joyous plant review of Chelsea 22 from Talking Dirty. Always lots to learn. A lovely antidote to all the sourness. The full 80 long plant list of ones mentioned is given in the vid drop down description. Alan Gray is the plant expert, esp on succulents and exotics. It works for as a podcast, but captioned images are given too.
Interesting to see the list from Plant Heritage of genus that don't yet have a UK national collection, including pittosporum, campanula, fescues, knautia, stacys and spiraea.
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When you don't even know who's in the team
S.Yorkshire/Derbyshire border
With some gardens l felt l got more of an insight than with the BBC coverage.