If you feel confident and safe, turn off the red main switch on the consumer unit (bare in mind the terminals/wires on the main switch are still live, so don't touch anything.
Remove the front cover and take a decent photo with flash on.
We are interested in the bars at the top with the black & blue wires. Are there 2 or 3 ?
We are also interested in the whole CU wiring
Do this.
If you cant/wont do that, you need a spark.