BristolDan,
The MM scale on the fences is from Axminster, cost about £8.50 and is a UJK product.
The hardwood fence to the right of the guide rail is zero clearance so no chip-out on exiting cut, more dust is captured, it's a kerf indicator for both the saw and the router and is also my depth setting device for the router. Plunge the router in to this kerf and the depth is set exactly every time. It gives full support for the piece being cut/routed as it's now fully supported on both sides of the cut. It is also how I calibrate the scale on the fence to ensure the scale is precisely set by measuring from the saw kerf.
It's fixed to the MFT top with 4 x M6 bolts in to threaded inserts and precisely in line with the fence. The fence is held to the MFT with 2 protractors and 4 bench dogs behind it, so between the MFT fence and the DIY hardwood fence to the right of the guide rail this fence is absolutely solid and never ever moves. This table gets used for lots of big cabinets and bookcases etc. for crosscutting but probably more for routing housings and rebates and it's always been brilliant. The guide rail has a Slop Stop. I reckon the reason many can't make the MFT cut square and consistently cut square is the fence. The weird looking black plastic clip for the far end of the fence is probably the culprit. Or the wobbly legs. Install on a stable base. Dramatic improvement.
The idea for the additional fence was something I found in a Youtube video by Peter Halle, who described it as a game changer. It really is and it's just a small piece of wood, a few fixings, costs next to nothing and it takes minutes to do.