Looked back through the olde Trackstar pics and found my budget approach. Worked better than any DIY piping attempt I've seen so it's worth posting hopefully.
Take a foglamp out and with some trimming you will see your inner wheelarch liner:
Closer:
Some brave stanley work later:
You can now see a path straight onto your wheel area:
Depending on the angle of your front wheels air should now find the same path and provide naturally fed cooling to the front brakes (or so goes the theory!):
Man I miss her so..
Jay