the baby bluetits have been informing me that they want more sunflower hearts.

they do this by fluttering up to the kitchen door (which they weren't doing before) and then veering away in the direction of the food store.

refilled 2 feeders and now the birdies are just flitting between the shrubs and trees and the feeders as normal.

Well, they are good communicators, if you know how to read what they have to say.