The label says "ionocidium hybrid". The Kew Index does not know Ionocidium. Neither does our friend Jay.
Now you may look at it, and say - ah that's an Ionopsis ( Ionumia). I have that ( or some of) in the collection too - and whilst there is a superficial similarity, it is not the answer - Ionumia tends towards being terete leaved ( the books say that it is "more or less" - my plants are, but less ... but this plant is just like a little Oncidium in respect of the bulbs, leaves, growths etc. Also of the flowers to some extent.
Again, If you look at Ionopsis sideways you see a tubular flower, flared out at the ends of the bell - I put in the 4th pic here to show the difference. No conjoining of petals or sepals here.
Sizes ? Flowers perhaps 15-20mm high and 12mm or so wide at the widest part of the lip.
BTW I have another plant, maybe from the same source, or maybe not, same name, in spike.
What is it ?
The correct answer ( I'm not sure who can be the judge ? )wins the 64000 dollars prize ( that's Bournemouth dollars, not US dollars, btw )