So to update, I bought a 3/4 shroud from Sunbeam Spares Company. Looks like original and a lot cheaper than the poor imitation from the states. Engine going back in now and afterwards will be looking at full blocking off horn holes and gap at bottom of rad. If I get time I will look at making up the bottom quarter of the shroud. A full enclosure gives an extra 25 percent increase in air flow. (All important) Anyone interested in buying some?
Need to get it done for Castle Combe. no pressure!