I would try record it for longer and also from maybe Inside the car and then inside the engine bay

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As requested but it is not too noticeable in this video at the start. Once I get into the passenger side you start to hear it more.
I will post a video tomorrow of the noise while It's moving.

 

Here's a video of me driving. Never went above 2500 rpm untill I did a 2nd gear pull at 1:10

 

Thanks for the extra videos..ironically the first video seems to be best to hear the noise, so I am basing my response on that one. This noise to be clear we are hearing the same thing thing but fro the video I can hear what I can only describe as the same noise 'kit' makes from the show night rider lol. Unless this is your phone woth some funny poor microphone. But if it is I can say I haven't heard that before. My advice would be to get it in to a garage and preferably a Vauxhall specialist garage. I know not what you wanted to hear but it sounds so unusual I don't know. Not saying it's serious just that it's usual. Sounds like it has something involving maybe water but I am just guessing hear. Hopefully other pipe up with ideas.

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After a few days of living with it you don't really notice it too much. I recently changed the intake on my car which made the car louder so you don't hear the noise as much now. Taking it to Vauxhall would be a total waste of money. Thanks for the help though and if someone does know what this noise is it would be interesting to know.