Switched live from the fuse box

[moojw]

Hi all,

Hope you are keeping well, I'm in need of your advise.

The heater blower isn't working, I've traced it to what I think is supposed to be a (ignition switched?) live, however, there's no power.
There's one wire running between the fuse box (Blue block connector on the back) and a black/white/white wire running between the switch and steering column, would anyone have a wiring diagram or let me know if the feed is from the fuse box, and if so, where does the blue connector get it's source from?

Oh and i've just discovered the horn isn't working either, could be the same issue, there's no feed to the horn.

I've checked all the fuses and I've cleaned up the earth crowns, no difference there.

Any advice or suggestions please

Thanks

[moojw]

is there a common dominator between the heater fans, horn and wipers? I seem to have issues within these