Hi Gaz!!
My giganteas are still doing well, thank you!!;-)
I love this plant: carnivorous all year round, catch preys with both faces of the leaves and, as you has said, beautiful flower!!
In my experience, first time they flower very often make a single flower... next year it could be more (this year here it is very rainy, plants have wake-up in May/June and a p. gigantea that had flowered for the second year has made a single flower... I think it is due to the weather of this year)... in the next weeks look at your plant: usually after the flower stalk pinguicula gigantea divides itself... if you left the new plantlet with the mother or divide it only when it has a well formed roots system it can flower next year;-)