The ones in my front garden (unknown variety) are always later than any others locally, but put on a great show.
I think sometimes they can be "blind" in a particular year because they didn't build up enough energy in the bulb the previous year. I'd give them a year or so to settle in.
Oh, and a tip for getting bulbs is to watch out for council workmen removing them from display beds. They just bin them so if you ask nicely they should be happy for you to take some - it's mainly tuilps they use round here, some of them are very smart.