Hi Mark,
Just as Brian has said, Banks do a kit for centre lock wheels - The 47 replica wheels where the ones i saw most commonly fitted to that set up and they are available in pretty much any offset/width you could possibly want, diameters may be limited (13" and 15" where deffo available) but its been a while so things could have changed?!
There used to be a White Europa across the header of the Yahoo Europa group (appears to have gone when i just checked on my phone - but that could be just down to my lack of signal atm) - that car was fitted with centre locks (just so you could look at them) but if the picture has gone then there will be pics on the Banks site under 'Racing' and Mark Primmet - he actually ran two different cars over time that where both white and 47 reps but they both had the centre lock wheels.
They do look good but they tend to need a pretty big bar to remove (bigger than you would want to carry in the car tbh!) and a similarly sized torque wrench to put them on if you are doing it properly?!
Jon