UPDATE:
Went to see my pal who is making these for me today. After looking at the sample hose i gave him, he produced a piece of hose that looked the dogs do-dahs.
It is 5mm, STEEL BRAID, ANTI KINK hose. (in fetching blue). Its going to cost a bit more than the smaller bore, but i think its worth it. I tried bending them, and they wont crease. The other good news is that he said he will make them from 300mm to 1000mm, with the price change acordingly.
As soon as he gives me a set price, i will update you and then you can decide if you are interested still.
Many thanks,MM