Silicon hoses ! Go to Autosiliconhoses in Mirfield, great people to deal with, any colour you like and quality 2nd to none. I've changed them all on my old crossflow caterham and a ouple on my plus 4.
I'd second the Mulfab ali rad, fitted mine about 3 years ago and have been in some warm environments, its a 200hp supersport engine and never a sign of getting too warm.
Somehow Uk specialist car manufacturers always go cheap on radiators, i had 2 plastic ones under warrenty on a new caterham a while back and eventually ditched the plastic for an Ali Radtec job, problem solved.
I got 10 years out of the plastic article on my Elise before i thought it wise to go Ali bearing in mind the well known HGF issues with the K series engine
