1.8 No FOB Have Key Have EKA but cannot start

I'm a long way from a tow.
Unfortunately the vehicle is armed (flashing red warning light on dash) so
Drivers door
- unlocked and cannot lock with key
- beeps once when opened or closed
Ignition on
- lights come on dashboard
- windscreen wipers work
- engine not starting
Bonnet
- alarm fires on opening can be stopped by turning key in passengers door to lock position once
Battery
- disconnecting obviously stops alarm but alarm restarts on re-connection even after waiting overnight
EKA
- does not de-activate armed status, presumably required for EKA to work.

Ideas anyone?

g