After reading the Sprint – Mark Adams New Tricks for Old Dog article and speaking with Tim Lamont from ACT I decided to purchase a set of Magnecor 8mm Electrosport ignition leads.
The ACT kit is great value and each lead is labeled with the cylinder number as well as being to correct length to reach from the distributor to the spark plug. http://www.actproducts.co.uk
It made sense to also replace the plug lead extenders at the same time as the leads, these are also available from Tim at ACT.
New leads fitted: