I have the same car. Same issues. You can see DPF related stats with this particular model using the pro version of the app Car Scanner Pro.

Thank you for your reply. Yes it seems the heat exchanger is leaking. And like the other post, the garage quoted more than the car’s value to replace it ! I am not qualified to even dabble with mechanics so a £10 bottle of radweld is going in, if it’s no good then it’s time for an upgrade ! Thanks again

Thanks, I'll try that tomorrow. I always just press the cruise control button to turn it off.

Pretty sure that'll be the 'cancel' button, for cruise control & speed limiter

So...  After a few months, I finally had the time to try and fix this problem.

There are 2 switches on the transmission box. One is as the bottom of the battery and that is the reverse switch (Not the neutral switch I said on the above post), and the other is under the car... u need to lift the car up to see it, remove the plastic cover, and it's at the side of the transmission, in front of the radiator (kinda.    you will see it).

Replacing that fixes the problem.  That switch cost like 2–5 euros

PROBLEM SOLVED.

Thank you all for the support and comments trying to help me with this and I hope someone will find this very helpful and not go nuts