OK cards on the table time.....
Believe it or not a Silverline 427683, the build quality is ***** as you'd expect, but it slides, tilts and runs true, and if it ever goes wrong they'll replace it without question, which is more than can be said for many 'quality' brands.
Correctly adjusted with a reasonable quality CMT blade, (must try and snaffle a proper handmade Atkinson Walker one when I'm next in Sheffield) it cuts within a well shootable half a degree, which is all I ask of it.