To be fair, I phoned the garage and they said to bring it down and they'd sort it out. It has warranty so should definitely be covered...if not I will fight it with the warranty company.
As for bitter taste, not really. It is a second hand car, I fully expect them to not be perfect and come with issues. My last car (Honda Prelude) I had four days and it completely failed (bad earth caused distributor to fail, on top of that, the car lost all its ECU codes). Here's hoping this is a quicker fix :D I did wonder if it is fuel related. I've always used super unleaded (more specifically Tesco Momentum 99RON) as I've always found my cars run better on it. If it does come back fuel related, I'll have to find a different fuel station with super. Near me there is only Esso (3 garages within a mile) and they all artificially keep their prices higher. Might have to find a Shell for some V-Power :)