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It's not unusual for 207s to show the anti-pollution warning randomly. In my experience it isn't significant and you just learn to live with it, but as yours is consistently showing at start up accompanied with the engine management light, it maybe something more serious. If the car appears to be driving okay, then I would be inclined to ignore it, if not, you will have to have a Puegeot dealer put it on their computer diagnostic machine - pricey !
207s have a bad reputation for random fault indications as a whole (Google it), some of which seem to be ambient temperature related - my father's 207 randomly shows the air bag light on very hot days but this goes away after a few start/stop cycles and a drop in temperatures. Fortunately, his MOT is due in March so when it goes for an MOT the light is always off - air bag fault indication showing is now an MOT failure.
Some people wouldn't be happy driving with an air bag indication, or any other fault indication, showing even for a short period of time, so this is a personal decision as to what you do about it.
Is there any fault indication on the dash where the radio display is.
Anti pollution is basically citroens way of saying emissions system so it could be as simple as a loose emissions pipe but from what you say and the car does not run it could be your catalytic converter (part of the exhaust system) has failed causing the engine management system to cut in and protect the engine.
If there is no fault apart from anti pollution showing in the radio display find someone with a diagnostic machine to give you a better idea of the fault. Hope this helps a bit.
You have to connect you car to a diagnosis machine or you can buy a obd2 cable for around $20 on ebay and diagnose yourself. Its probably something related to a specific sensor or a couple of sensors, i.e. catalytic failure shows an error with the catalyser sensors, showing a code like 0420, then you can look it up online on what does that code mean and what you can do to prevent it from showing.
I would think that your vehicle has a voltage regulator built into the alternator, but I am not sure. I do not have alot of Jag experience. But this sounds like what your problem is. The voltage regulator is stuck and making the alternator put out full charge and wreaking havoc with your electrical system.
If your Vehicle Spped Sensor has gone bad, it can cause loss of anti-lock brakes, "anti-lock" or "brake" warning lamps on the dash, the speedometer or odometer may not work properly (or at all), your vehicle's RPM limiter may be decreased or automatic transmission shifting to be erratic.