The popular money was on Grape hyacinth, but that would appear to be proven wrong confronted with this new evidence. These flowers that have bloomed are a very delicate pale purple, with each bell less than a centimetre across. Note that the time of year is probably no clue as these are growing indoors in a pot.
So what are they? Send in your answers via the comments below.
Update (April 2010): Almost certainly they're Bluebells. Loads of them have now come up in the borders, looking rather more vibrant than these, but I think that's just the effect of growing them indoors.
