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I think your Penstemon is a form of pinifolius called 'Mersea Yellow' though there are others just about the same but given different names. I like the Roscoea. All my scillifolias are a quite pretty pink but they seed around like billyoh.
The second is Arisaema costatum, which was to replace my no show - the same no show that poked it's head through the next day!
What a striking arisaema meanie, complemented by the penstemon in the background.