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And there's your fob listed for a rover 600. Same board

Theres the pics with the numbers from inside the keyfob. My mate found most information by following the part number on that little black chip.

Right, so there has been developments. I took the information I got from yourselves, another forum about an mb6 I found on here, the Haynes manual for my car and I talked to an electrical controls engineer who's a friend of mine who was able to find ridiculous amounts of information by having a look at the little circuit board that is inside my key fob, so strap in haha. First off, you were all absolutely correct about the key, it's a copy, original key probably long gone. I found out that there was in fact an optional extra alarm from factory. Tell tail signs of your car having it are that there's no siren, it just sounds the horn repeatedly, no extra boxes or anything around the car (obvious I know but stick with me) and an infared receiver made into the dome light next to the rear view mirror. I will post pictures of that last one but my car has all of those. So, I found out its one of very few alarm systems that used an IR signal instead of radio waves and I found out that Honda wired these so that the immobiliser can be disarmed two ways. One, the IR key fob sends the signal, the car is happy and switches it off with the alarm. The second is the chip in the key, so when the fob dies your still good, car detects the key, happy out, triggers the central locking to say its happy when you turn it and switches everything off. What happened to me is that whoever owned the car before me lost that original key but had the two plastic copies and the two keyfobs which turned out to be made by valeo and were also used in the rover 600 and a couple of integras. I also seen the circuit board part number on a Renault site too which was weird. So basically with the absence of the chipped key, my car has been relying on the fobs to disarm all along. I realised that turning the key in the door only works if the fob is powered up, presumably because the fob still interacts with the car. My controls friend said that the car probably looks for the infared emitter when you turn the key and the fob automatically bounces back. So long story short, I split the fob and seen that the battery contacts were slightly corroded. I sanded them back and put it back together. Turned the key in the door, bam, immobiliser switched off, alarm turned off. My next mission is seeing if I can get the IR signal cloned with new fobs. I'm also going to see and auto locksmith tomorrow to see if there's any way I can get a new chipped key. I had that done before with a Toyota, I just brought them the ECU and the key together and the sorted it in 20mins but my car being the major pain it is I won't hold out hope for a solution that simple but I will let you know. So there you go haha. If there's anything I got wrong please let me know but I put a lot of effort into getting this info so I hope it's all sound. Sure looks like it from my end. Thanks so much again to everyone.

I'll have a look when I get home today. Fair play, really appreciate all the help and info !!