Bonnet lock not working properly

So I am trying to understand what is happening. You replaced the cylinder and not it turns left and it does unlock but it won't turn back? Does it actually unlock the lid and open or when you turn the key it doesn't do anything?

If the new cylinder does not unlock it but it does turn then the release is the issue in the cylinder.

Oh. I am sorry. You are talking about the release behind the Ford badge? This makes more sense because you have to turn it left to pop the hood and then back to the right to release the latch and lift the hood. We don't have this in the USA so it took me a minute to catch up.

If the hood pops open when turning left, and the key is able to turn right but just doesn't release, try pushing down on the hood/bonnet when turning right and see if the latch releases. You can try jiggling the hood just to see if the hood pops loose. Basically, I suspect the cylinder is releasing but the hood is stuck. Refer to the picture for hand positioning to "jiggle" the hood. If you are able to get the hood open by doing this, then do not close it again until you soak the latch down with a spray lubricant and preferably work the latch open and closed a few times just to make sure it frees up.

If this is not the issue then we are going to have to start looking at the cylinder again. If it does not pop when turning left then you may need to drill it out and use a screw driver to release the latch.

Let me know if I am still missing something. Thanks