Could be a sangisorba?
Could 1 be a stoksia or scabious?
Bacopa or Sutera are good trailers. Lots of daisy flowers. Comes in white, purple, blues.
Verbena around the edges
Nemesias and diascias seem to flower on and on and on
There is a variegate Syringa emodi grows and for sale in the UK. Don't know if that could be it?
Or Dianthus-pinks if they haven't already been mentioned?
A lot of the conifers have brilliant young blue growth e.g pinus and picea this time of year. Festuca ellijah Blue.
Would say No2 is Viburnum tinus doesn't look glossy enough for Photinia.
Could climber/twiner be Lonicera Copper Beauty, seems pretty vigerous
I wouldn't have it in a children sensory garden, euphorbia's sap is horrid especially if got in eyes/delicate skin!
The following are hardy in Northern England
I wondered pittosporum but maybe the leaves are too wrinkled?