Are there any sensors or related parts that can go wrong here? My car is telling me that the bonnet hasn't been shut properly when it clearly has....
I really hate these "features" that the manufacturers build into cars ☹️

If anyone can point me towards a DIY guide for replacing this part(s) I'd be most grateful!!

There is a hood position sensor or switch located on or near the lower (body) latch.

Do your windscreen wipers still work?

@Warrior193 I did not think to test the wipers whilst the "bonnet open" warning was up. It comes on intermittently which is what made me think it must be some sensor that is on its way out....
Are you aware of any guide that I can refer to online? I came across a post about bonnet sensors for an Octavia but there wasn't much guidance on its replacement.

I think there may be references on the forum when members have overridden the sensor to allow control modules enter sleep mode while the hood is open.

I haven't had occasion (yet) to get access to check that sensor - I bet that's put the hex on mine now!

I’ll have a browse through the workshop manuals and see if it’s listed.

I think they are build in to the bonnet catches. I can’t think why else there would be an electrical connection to the catches.

Perhaps try adjusting them just in case it’s not pulling the bonnet properly closed?