Back in the 90's, my bro had a 40" Toshiba CRT (non-widescreen) - it was pathetic though because his living room was far too small for it's footprint, it dominated the room. This was when Sky Digital first came out in about 1998/1999 (I only remember that because I remember watching .tv on it a lot lol).
Most manufacturers made upto 36", its just the likes of Argos et al didnt bother selling them.
It's a shame the Philips and Samsung ultra-slim CRT technolgies made it to the market too late (or never made it to market at all) and were succeeded by Plasma and then LCD before they became popular - 32" CRT's with a dept of less than 18cm were not that far away. I remember back in 2003ish, Philips announcing (possibly at CES) a roadmap involving CRT TV's with depths of less that 9cm.