Would anyone know whats I am likely to have destroyed ! ?
Possibly nothing ? If you are lucky. And as long as the battery is still OK.
If you have a good poke around the battery connections and wires and fuse holder, you may be lucky and find something that has been lightly cooked and lost its conductivity/connection. A good clean of all connectors around there, inc battery terminals and fuse holder may well restore the connection. The wire from the battery to fuse holder may be suspect too.
Check the power wire to the switch is still intact too, if nothing is obvious.
The short shouldn't have affected anything further downstream. Hopefully.
As long as the short wasn't further afield...
Good Luck, &AppyEaster !