Spiney Norman - no need for an apology! That is exactly the sort of information I am looking for.
At least now I am not going to spend the weekend mooching round the extended centrelines of 06L and 24R looking for marker beacons! I guess it's a good job someone invented DME - we'd be over run with beacons if we had to have new ones for 06R and 24L aswell.......
Thanks everyone for the information so far - please keep it coming.
At the risk of stating the blindingly obvious - photos are welcome too!
Cheers all,
Nick Locke