BUT the stalk is only giving you full beam - from what you say, any attempts to use it to switch to dipped or to set the indicators is being ignored. The only other function on that stalk is cruise control (if you have it) and that is a switch in the end of the stalk, going to the ECU.
I'd really be inclined to look at the stalk switch.
If a fuse isn't blown, then you don't need to change it. Inspect it (should be obvious if it's blown, or use a continuity tester), put it back in if it's ok.
Fiddling with the fuses shouldn't cause more services to fail unless you've put some back in the wrong slots and they've blown. About the only other way this could work is if the fusebox contacts and fuses are badly corroded - but I'd be very surprised if this was true, and any way moving the fuse should improve matters, wiping the contact areas cleaner.
The Horn should be fuse 40, 20A, yellow fuse. Don't know which fuse affects central locking, there should be other things going wrong as well if it's the fuse.
