Llanigraham

Do you realise you are replying to a post made 9 years ago!!

Doesn't look like a standard fitment

That light can cover a lot of "problems". You need to get all the fault codes read. Also usueful stating what model, age, engine and transmission you have.

It can take a while to show use, especially as the tank is saddle shaped on a 4x4.

Thoroughly check the wiring where you moved it to fit the filter.

Those things are commonly known as widow makers!!

As memtioned elsewhere, Carista doesn't allow this.

The sat nav thinking you are in Germany is normally due to water ingrees into the aerial base.

IDC hasn't visited this forum since Jan 2022!

One of the on-line scrap yard aagencies, perhaps? And the only requirement for the MoT is that they work, and your's does, though not correctly.

You do realise you are reopening a thread that is SEVEN years old!!

No difference

As Warrior says, your battery has failed and needs replacing urgently since you are unlikely to get it to hold a charge. Get that done and then see what the situation is.

If you've flattened your battery like that I would be very suspicious of it's state now. Have you actually checked the resting voltage?

This is going to sound daft, but have you checked the battery? There are known strange occurences when a battery is starting to fail. Check the resting voltage, after leaving the ignition off for atleast 3 hours, and before starting the engine.