I was going to use the flexible picture rail from there but it was £18/m as opposed to £2.50/m for standard from B&Q.
Likewise the skirting - I think they deliberately don't use the standard torus/ogee designs or typical heights so you have to buy matching from them for the whole room.
You could use flexible skirting board:
https://www.victoriancornice.co.uk/flexible-skirting-board-sx165f?gclid=EAIaIQobChMI1YCOus3o5wIVw7TtCh2FVQiTEAQYASABEgJJpvD_BwE