Immobiliser Non Problem, I think

[Retro Pedro]

What a day
Trailered my SWB A 2.8TD home a few weeks ago (no tax or MOT, needing a few small jobs to get it through).
Car started perfectly, drove it up on the trailer, no dramas. Got it home, started it again on the key, reversed it off the trailer and drove it up my steep drive for off the road parking.
Went out a couple of days later, put the keys in the ignition and the hazard lights started flashing.
Thinking I had put the hazards on by mistake, I played about with the switch and wondered why they would not switch off. Not wanting to let the battery drain, I disconnected it until I was ready to bleed the brakes and put the new exhaust on.
As my Toyota mechanic nephew as staying at mine for the weekend, thought it I good idea to start the motor up today and do the brakes. Having charged the battery overnight, reconnected it and tried to start the car. Hazard lights started flashing and car would not start.
My nephew suspected the immobiliser was playing up and thought that on some immobiliser, you can remove the fuse and by-pass the system. He had to get off on his long journey home, so could not stay to advise me. Out comes the Haynes manual and I read that there a 2 sorts of immobiliser systems. Upto mid 1995 there is the key fob option, and the later version which is to turn the key to 'on' position. My car was first registered December 1995 so I'm thinking it could be either. Looked at the steering column and there was a small grey plastic disc which I assumed was the place where a key fob would reset the system. I further convinced myself I had the key fob variant because my set of ignition keys seem quite thin and not fat enough to take a chip for an immobiliser.
Checked all the fuses under the bonnet and above the drivers foot well compartment. All seemed OK with none indicating they where for the immobiliser. Off comes the steering column cowls and the grey disc turns out to be just a blanking piece of plastic. So I now turn my attention to the alarm components which are located behind the side panel of the passenger foot well to see if I can find an immobiliser fuse. Played about with a few relays but still the hazards lights kept flashing.
Residing myself to believing that I was going for a large main dealer bill to sort out the problem, I thought I'd give it one more go. Turned the key to the 'on' position for a couple of seconds, then to the startup position, and she fires up a treat.
Touch wood, the hazard lights are not flashing. What a relief.

[Drift]

Ahhaa the fun of the Frontera Alarm system
These should be classed as Thatcham class 1 as when the play up no bugger can start them

[Retro Pedro]

Bloody immobiliser - Thinking I didn't have a problem was premature thinking on my part.
Car started perfect this morning, been starting continuously most of the afternoon. Been bleeding the brakes and had the car on tick-over whilst doing each individual corner, as advised in the Haynes manual, with no problems at all when starting the engine. Came in, had me dinner, went back out 1/2 hour later and the immobiliser decided to give me aggro.
I don't believe it's linked to the horn, because all that happens is the 4 way hazard flashers activate and the car won't start.
I've been hunting through previous post and can't find any advisory info on a similar problem.
If anybody as got any ideas on how to sort problem, any advice would be gratefully received.
Thinking about last weekend, I did have to passenger side panel off and disconnected and reconnected a few relays. Might have been pot luck because I did see on one of the post that there is a white relay that is linked to the immobiliser. I'll give that a try tomorrow night.