Alfie have you looked at the arc eurotrade toolposts ? http://www.arceurotrade.co.uk or just click the advertisement at the top right of the forum homepage .
I use an axa size wedge type on my 9×20 ( called an AL50G here in oz ) mine came from ctc tools in china and is very well made and cheap to but but freight and insurance was a killer !
These units came with a 9/16 post so all i had to do was drill and tap the compound slide 9/16 nf.
Ian .