I have wondered that myself, lost EGR and EGR cooler (essentially another coolant heater) in my case but can't remember if it was any better last year before that! 
Pretty sure I wasn't blanking 306 HDi's when I first had them though, in fact probably not until the Moonstone that Tose now owns, and they were still taking forever to heat up back then.
Pretty sure I wasn't blanking 306 HDi's when I first had them though, in fact probably not until the Moonstone that Tose now owns, and they were still taking forever to heat up back then.