Having suffered stone damage to the radiator last year, I decided to have the original radiator re-cored.  In order to prevent further damage in the future I decided to replace the radiator grille as well.  The original grille consisted of the '7' symbol and a few horizontal bars, and wasn't particularly stone proof! 

The new one has a '7' symbol but with a metal mesh which completely fills the nose opening.  

Unfortunately the locating prongs on the new grille didn't all coincide with the positions of the existing securing holes in the nose cone.  This was soon resolved by slightly elongating two of the locating holes with a small needle file, especially bought for the purpose.  I'm beginning the amass quite a collection of tools now, all as a result of 'fettling' IGGY! 

The new 'all black' grille in place.  I think the '7' and its surround needs to be painted yellow to match the nose-cone band.