I think 5 is mostly Dicentra formosa (the blue-ish foliage & the lilacy-pinkish flower top centre) but there's a lot of dead lavender flowers poking through, and one branch of lavender near the bottom of the pic (grey spiky leaf, blue-purple flower)
Doncaster, South Yorkshire. Soil type: sandy, well-drained
Just to add... no. 1 I would say is Calamagrostis brachytricha no. 7 is Pennisetum, possibly variety 'Karly Rose'... no. 8 is Pennisetum alopecuroides possibly variety 'Hameln'... no. 12 is Euphorbia mellifera...
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You are right.
That is what happens when I rush.
6. Ceratostigma.
https://www.google.co.uk/search?q=Ceratostigma&rlz=1C1CHBF_enGB785GB785&source=lnms&tbm=isch&sa=X&ved=0ahUKEwiJy_-h7Z7dAhURY1AKHb5ZDgYQ_AUICigB&biw=1920&bih=943
In the sticks near Peterborough
no. 7 is Pennisetum, possibly variety 'Karly Rose'... no. 8 is Pennisetum alopecuroides possibly variety 'Hameln'... no. 12 is Euphorbia mellifera...
https://www.google.co.uk/search?rlz=1C1CHBF_enGB785GB785&biw=1920&bih=943&tbm=isch&sa=1&ei=klqNW73wBs7fwQKAhbVI&q=Euphorbia+mellifera.&oq=Euphorbia+mellifera.&gs_l=img.12...0.0.0.10668.0.0.0.0.0.0.0.0..0.0....0...1c..64.img..0.0.0....0._aIqm_9A4YM