Vauxhall Meriva 2014 Petrol - Engine making chirping sound

Does anyone know the source of this sound? Four garages have looked at it, and no one can figure out what's wrong.

Here is a YouTube video I recorded of my car:

 

Hi, Cant view the video, but I had a chirping sound on my Meriva 1.4 turbo, most noticeable after turning off the engine, but others could hear it most of the time. I put up with it for 3 years until a warning light appeared. My local garage who are all ex vauxhall mechanics immediately identified it as a crank end seal leaking, and pressurising the cam box cover, eventually leading to an input sensor failure (MAF I think) New cam box cover needed, pattern part but recommended by the experts, new sensor, and the crank seal which was at the easy to get at end of the crank. About £380 all in and done, chirping gone!