This has to be the most irritating message on the web. After 4 days of head scratching and research I think you may actually be able to read this.
So as per usual I was trying to do too much myself, and in a tired state went about updating some settings to speed up the site. It went horribly wrong!
first I managed to disconnect my domain and lock myself out the editor page. once I got back in through php the fun really started, all my dns and name servers were gone, well, so I thought.
after resetting things several times I forgot to clear cache settings so kept seeing the dreaded error 404 even though everything should be fixed. so I reset again and again and just for good measure again and again and again. still my problem persisted, until it finally dawned on me to sort out the cache.
so long story short, feeling slightly foolish we are now back in action. but I am leaving the advanced settings well alone.
If only the internet was made of wood!