Thankyou everyone for your help, it is now fixed
I dropped Goran at 7Dana an email on the off chance this morning. He very kindly checked the site, and emailed me the fix. Huge thanks again to him!!
After all that, it was an unclosed span tag on the welcome text which I obviously botched - no idea why I didn't think of just deleting it as it was the only bit that I touched
What a numpty
