Well my silicon hoses arrived yesterday and I've started fitting them now, although only sent me 1 length of 8mm ID hose instead of 2 so I haven't been able to finish the expansion hoses. I am impressed with the way they look and all hoses should be running down the same side of the car and will be in top of each other so should make for a tidy looking install.
My new header tank cap arrived today as well, so that's been fitted.
I just need to order the remaining bits for it as well as some big p-clips to secure the top hose to the chassis rail.