You might try looking in Concrete5's logs in the dashboard. Just type logs in the intelligent search box top right in the toolbar. Or look in PHP logs on your server.

Or you could post the code from the page here to see if somebody finds anything wrong

Unfortunately the logs from the dashboard do not show anything at all, the log I posted before was the only log that i got from my directadmin install. This particular page had received some content editing, but the code was untouched before it went wrong. I duplicated the page via the flat view but the error remains, is there any way to deconstruct the content from the page to check bit by bit where something is going wrong?

What you can do is, from the sitemap, check the different versions for that page. You can preview the different versions so you should be able to find out the last one that's working.

To find what exactly is doing that you'd have to do some investigative work starting with which blocks were edited last and may have lead to the issue. Then go to the database and look in the block's saved values for possible errors... It's pretty involved.

Also just in case, empty Concrete's cache and see if it makes a difference

I managed to fix it. I retraced my steps editing the page, and one of the last things I had done was add a couple of photos to a file set that was used in a gallery on this page. It turned out one of the photo files was still hi-res (18mb), this caused the page load to stop. Removing the file from the fileset fixed the problem as quickly as it came up.

FYI I did try to check earlier versions of the page but they all came up blank, as it was not the page or a version of the page with the problem but a particular file in a file set that was used on the page.

Thanks for thinking along with me 👍