It turns out that there are 5 cables.
4 are 2 core and earth. 1 is 3 core and earth, pretty sure this goes to the single switch.
All blue go into a block and all earth cables are together.
That leaves...
Cable 1 - Brown - L1 (Top)
Cable 2 - Brown - L1 (Top)
Cable 3 - Brown - L2...