thank you for the link blackhat, are you sure they will work?
ive just taken out the innards and 3 of the four brass screw in bits that the plug end slots into are badly corroded. the springs in them that grip the spark plug have disappeared.
are these bits the same in other caps?
was thinking i could buy some cheap caps and swap them out?
and yes snakebite it is a shocker. £250 for 4 plug caps is crazy!