A bird was in and out of the nestbox this morning - looked like Ivy and I think I could see something light on his left leg.
Both Smiley and Joli have purple anodized bands on their right legs and their coloured bands black/green and black/red bands on their left legs, so it didn't look like either one of them. Good to think that Ivy still has the nestsite.
Having said that, one of the times a bird was in the nestbox, I don't think it was Ivy, I think it might have been Joli but that is just a suspicion, the bird looked slightly bigger/rounder but that's just my impression. Been glued to the cam ever since (under the weather today I'm afraid) in the hope that one or both might turn up again ... nothing so far ...