Thank you for your comments Bitsofbrits. Yes the cable is broken too so you're spot on there too. The car is 10 years old so maybe a new cylinder is the way to go albeit it doesn't seem too rusty - I'll double check that.

Now for the complexity of where the cables all go. The cylinder bit should be straightforward but the rest of it is beyond me but I'm sure someone can point me in the right direction and also where to get the cables from.