I had a similar problem on my roadster passenger window, I found that if I flicked the window lock button situated on the drivers door the same time as operating the window switch, again on the drivers door it worked. You can actually here the relay clicking in and out when you do this. Its happened to me several times. My hood sometimes fails to lock down, I found that it being a little damp, mohair type it swells a bit. Also if its cold it wont lock down.
I like welsh cakes.