Hi Paul, As far as I remember the power supply to the brake lights is one source with all the feeds to the lamps teed-off. You say you are gettting no power to the pods but have you checked power is going to the connectors (the ones that clip on to the pods) It is quite common for the circuitry in the base of the pods to go faulty and if one is duff the feed to the other can fail.
Keeep us posted on your progress or lack thereof.
The final solution was......
There is a plug located behind the boot lining on the off-side wing. This had worked its way loose, one push and the lights came back.
many thanks to all those who contributed