That's a fancy router table fence

[Britman]

Got to admit pretty fancy router table fence he's made there. Using linear bearings.

 

[TheTiddles]

Carbatech of New Zealand make (or did make) one with a top bar and sliding fence like that. They don’t export to the UK and had no interest in doing so when last asked, which is a pity as it’s about the best fence I’ve ever seen
Aidan

 

[Michal]

Linear bearings like this can be found on aliexpress. I think that they delivery to uk

https://m.pl.aliexpress.com/item/10...0bc90422398e4999c877.jpg_640x640Q90.jpg_.webp

 

[Spectric]

Hi

https://ooznest.co.uk/product/linear-bearing-slider-blocks/
May be to small