Well the problem is solved thanks to you all. There is now light in deepest NZ. The key is the relay.
Process followed as in notes by sierrafery and the Wabco manual above. In summary I;
1. disconnected the ABS relay under passenger glovebox
2. bridged terminals 2 and 5 and 4 and 15
3. turned on ignition and watched blink cycle (long, short, gap, 2 short, gap, 6 blinks (the code can be other numbers of blinks)
4. as the code cycled for the second time I disconnected the bridge wires then turned off the ignition
5. turned the ignition on again and light behaved normally (on/blink/on again until car reached approx 5km/hr and then off permanently)
6. re-connected relay (remember for those following me I had done all this without disconnecting the relay and had not cleared the fault code).
In the various instructions there wre none for finding the relay so here goes;
- passenger footwell under glove box
- remove cover
- see relays etc on left side
- there is a metal 'tray' of relays lying flat in the centre and on their right a set of relays on the diagonal
- undo the front bolt and lower the tray
- the relay you want is the second one in (2 tone green) and the 4 wires are 2xblack, 1 x black/green, 1 x brown/red
- separate the relay in the middle (it pulls apart)
So again a heartfelt thanks for the help