Hi guys, totally forgot to update this thread but I found what I was looking for in the end. I bought some online after much head scratching.
The "Dispotex" branded ones are about 3 times as thick as the rubbish I found in the supermarket, I could probably have reused them if it wasn't for all the spillages!
I bought them here: http://innsupplies.com/disposable/paper-table-cloths . I hope this helps somebody else out too!