Ok here's my update... It's good news... No GREAT NEWS!!!
In the engine bay, passenger side or on the right when looking in to the engine bay, you'll find the fuse box tucked away under the inner wing.
Disconnect the battery before doing anything!! TAKE MY ADVICE ON THAT.
now after removing the fuse box cover you'll see. A tray of fuses & multi connectors.
Remove all the connectors by first pulling the red toggles & lifting. Then tuck them safely either side of the battery tray.
Now you'll need a 13mm DEEP socket and ratchet... Remove the black wire connected to the front side of the fuse box,
BE ADVISED THIS IS A LIVE WIRE WHEN THE BATTERY IS CONNECTED.
Now here's the tricky bit... You'll need a flat blade screwdriver to lever the fuse tray out of the box.
The TRAY clips into place at each side closest to you & furthest from you as you look from the front of the car.
Once you have removed this tray you can closely inspect each fuse then just put it to one side.
Now you will have exposed 5 or six wires coming into a fuse block! At the bottom of the fuse box.
Here I found one of the large 30 amp fuses popped! Simply replace and refit your fuse tray in the reverse procedure of removal!
Ensure you have refitted everything before reconnecting the battery.
The
fuse is £2:79p from Halfords. As they are large 29mm wide fuses sometimes known as Mega or Maxi fuses. But may only be £1 from your local
spares shop if they've got them.
eBay £1:50p
I hope this helps someone in the future! But hope you don't have this issue in the first place!

- Maxi Fuses on a Citroen C3