So then, apologies all - I went away for a couple of weeks.
I set the watering up before I went using a stopcock in the Wilma res connected to a larger res outside of the tent and Lung room.
Inside the Wilma res the nuts were Grow A&B, and in teh larger feeder res it was Bloom A&B, so during my absence the increase in bloom took place and the bud formation started nicely. When I got back last night I threw in 30ml of PK9-18 to give them their first dose of that being about 2.5 weeks in to flower.
Overall Happy with the progress - she grew plenty in the time along with her sisters in the tent, the only downside for being away that long is no one can keep them tame so I returned to a a bit of a jungle. Got a good clear up this morning and will have another one tomorrow to strip them bare before being left alone to the end.