Rut, my old discs were the standard undrilled ones. A fellow Morgan owner from WA ordered these for his +8 and a drilled set for a 4/4 were delivered by mistake. The supplier sent him the correct set and I brought these without the postage costs to WA. they may make a small difference to my brake performance but I doubt a great deal.
The drilled discs may make more of a difference with four pot calipers. Some interesting views
here and click on "mechanical" at the top of the page. 
