Electronics for the win!!
I must say it was very effective and on an engine that did not have this problem you would be able to hear the injectors very clearly that will help a lot with faultfinding. I noticed on my injector cleaning episode that my blocked injector sounded different to the others when it was blocked and identical after it was cleaned.

The noise has stayed pretty much the same since I got it. I just checked and have done 45 000 km since I got it and it has always had this noise.

I didnt consider the balance shaft, maybe I should go through the engine in EPC and check what else could be the issue. It does seem that the noise is quite high up in the engine close to cylinder 5.

Dont know anything about camshaft magnets will look into it.

I did however replace all the speakers in the car recently and that has helped a lot with the engine noise...

Thanks for the advice