Yes, I think you are right.
I've seen it without flowers, and in flower, but never as it starts to produce a flower spike, and this one has to be stressed.
Tucked in the wall it would be quite happy, but this has had to come out into the full sun, on a SE facing wall.
As the plant is growing in a cavity, in a 19th century stone wall, I would not be surprised to find that the leaves to the left, are the basal leaves with extended/etiolated petioles.
I intend to revisit in the next couple of weeks or so, to check on a couple of neolithic sites I didn't have time for. I will look in on this and the very small plant, which is the subject of my other post, while there.
Sorry for the LONG delay. I can be extremely lazy at times.
I did go back to check it out, only to find that flowering stem never made it.
It was still there, but the stem had become dehydrated where it exited the wall (through damage?), shriveled and broke off.