Winflex TT 125 U wiring

Hi, the user guide that came with my fan refers to wiring to terminals labeled L1, L2 and N but none of these are on the fan.
There's a terminal block labeled 1,2 and 3 with a black and a white going into it.
Another terminal block with the thermostat going into it.
A brown wire with a closed end and a yellow going into a terminal block.

Where do I put my blue and brown wires from the mains? (UK Wiring)

Thanks in advance.

Picture attached.

I'll answer my own question here for future reference.

You have to pop off the two knobs and undo the circuit board from the plastic housing and the terminals for the mains are there on the now-exposed sid eof the circuit board.

I have the exact same fan, I can't figure out how to remove the board without damaging it. How do I wire it up?! It's driving me mad