[W. Knight]

Even if for whatever unlikely reason they wanted to, in a lot of cases they probably couldn't anyway. People seem to forget the amount of private individuals or small independent companies that have sprung up and bought 'all the IP and logo of former company x' in recent years to try and either 'protect' it, trade off their prior goodwill, or possibly just in the vain hope someone with a big chequebook will want to buy it back at some point. TVS (admittedly never ITV plc), HTV and Carlton at least I'm pretty sure have all been snapped up by someone else these days (I'm sure we've all seen those hideously forced disclaimers people have been made to attach to Youtube videos involving the original companies way pre-dating whoever 'bought the name' 20 years later), so ITV would be steering well clear.

The most famous example would be Victor Lewis-Smith's A-R (producer of TV Offal). 

TVS (with its fleur-de-lys) got snapped up by a community TV consortium, similar things with ATV IIRC, Ian White holds TV-am while Southern is now Nic Ayling's!

This, plus the age the full regional days has passed, say the current plc is a one-way track. Alas, it'd be nice to see some names coming back, especially in places not necessarily regarding themselves "British" that much.