With some dealers allowing customers to buy the warranty and many others who don't, It appears to be hit or miss and it really should not be that way.
My dealer said no and I complained and said that when I bought the car last November 2013, the salesman did not offer me the extended warranty and that was not my fault but they were not interested so I called Ford Protect and explained that to them and the lady I spoke to said that she would happily sell me the warranty but added that it was not up to her and advised me to go to the dealers sales manager because he was the only person who could do something about it.
I complained again via email to my dealer and I got a reply back saying that they may have a way to sort the warranty out which would involve "back dating a supplementary invoice" and, if I was to call in tomorrow, they are sure that they could sort this out for me.
Sounds a bit ridiculous but, that's probably the sort of thing that the lady at Ford Protect meant. i.e. The dealer has ways of working around the rules - if it works, then I'll buy it.
I'll post back with an update tomorrow afternoon.