Telstar 1985/AR - Engine noises

[Flokos]

Hello everyone,
I've got a Telstar 1985/AR model and I've noticed engine noises suddenly, when I've started the motor. I cannot pinpoint the source of the noise but I'm not sure if it's electrical.
The car has done 210,000kms and with no apparent warning (slight noises, etc), it decided to revolt! No petrol contamination, no gear box problem - smooth gear pickup, good power. T-Bar gear selection changed while in parking and noise changed slightly. Reverse and forward car movement didn't stop the noise.
Interestingly, as I've started the motor, the ignition key (barrel) was hard to rotate and when it did and the engine started, the brakes light indicator stayed on. I've recently checked the brakes pads and had no problems with thickness, no brake fluid leak. Transmission oil is still pink.
Any assistance will be appreciated. Thanks, Flokos