Hi Graham.
That looks like a pretty healthy plant, so there is nothing obvious that jumps out, but I can generally comment that the two most common causes for plants not blooming are insufficient light and excessive nitrogen. The latter is easier to evaluate.
What formula of fertilizer do you use, at what concentration do you use it (real amounts, not "half strength"-type descriptions that are of little value, please), and how often do you apply it?
The "insufficient light" aspect may simply be a matter of moving the plant to a brighter window, but we don't want to burn it with drastic changes, and plants do adjust, over time.
It appears that the smallest growth has the remnants of a flower spike, but that may have occurred when the plant was grown under near-to-ideal conditions in the greenhouse (likely in Hawaii).
An otherwise healthy plant will bloom when cultural conditions are "right," and when they have accumulated sufficient energy stores to do so. Under one set of conditions, that may occur rapidly, while on a home windowsill, that may take longer, leading to less-frequent blooming.
Unless your plant is being stifled by excessive nitrogen (it doesn't have the deep, emerald-green appearance I'd expect for that), while not necessarily essential, I'd have to give the recommendation of maybe adding some supplemental light, and above all else, be patient!
(PS: I'm currently in Bucks County, too (Buckingham Twp.)
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Well I had the pleasure of having off of work yesterday and I observed the sunlight coming in and found that there is strong morning sun from about 8 to 11ish. I also noticed i was missing out on about an hour of good light so i moved the table over a bit. So hopefully that extra hour has a positive effect. For food right now i am using jacks 20-20-20 at an1/8 teaspoon for a half gallon h2o. I also have jacks orchid mix but have yet to use that. I apply food every other watering. Thank you again! being a newer orchid grower i could use all the info i can get.
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