So let me get this straight?
Was the camera van stationary or moving?
You were driving at the legal limit - 60 which is not a problem.
Are you suggesting that you overtook on a central solid white line system?
If that is the case, then that is a different issue. First of all, a solid central white line does not mean that you cannot overtake, it simply means that you are not allowed to cross over or straddle the centre white line except under certain circumstances.
If that is what you are referring to, then that is where the issue might lie.
Firstly, it does not need a camera to record you committing the offence, it only has to be observed by someone deemed to be an expert and the camera van operator falls into that category.
So all you can do is wait a couple of weeks and see if the dreaded NIP (official notice of intended prosecution) drops through the letterbox.
If the Police are considering prosecuting you, then the NIP has to be sent in sufficient time to be reasonably assured that it will arrive within 14 days of the date of the alleged offence.
If it takes longer than 14 days, then you have a statutory defence (depending on the dates on the document and the postmark on the envelope) so all you can do is wait and see.
Assuming I have understood your post correctly, don't lose any sleep over it, it is not the most heinous traffic offence, although it will involve points and a fine if convicted.
If I have misunderstood what you have written, please accept my apologies and maybe clarify the ppints I have got wrong or misunderstood?