As Pete said, would this extension work, seems to be in stock.
This table extension adds an extra 275mm to the width of the Axminster Craft AC254TS Tablesaw on the left hand side. It gives you a total table width of 1,035mm or 517.5mm to each side of the blade. The extension provides vital support, especially when...
www.axminstertools.com
Do keep us posted on what you decide as I'm in a similar position and have been looking at rip fence alternatives. Don't seem to be many options in the UK, they all seem to be in the USA!