Hi Chas how goes it?
I thinks

the fronts retail at £400.00 each
and the rears at ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,£450.00 each
If you have anybody you know with a garage you can get up to 15% discount depending on your dealer
You could try the technicians in the workshop and offer a drink as they get 25% off
Or pop to Munich Legends(no doubt you know they are local`ish
to you)they are probably the best tech`s in the country.
Or there is the copy route
They look the same from a distance but are not as strong as ours are forged but are a third of the price
Food for thought but IMHO i`d go original so when the "ring" calls
you need not worry
God Luck
Steve Mac