I'd like to have a look and see what's going on inside all that foliage ...
I wondered if No. 2 could be lots of suckers/shoots from a wisteria - looks like there might be a wisteria stem involved with that trellis thing behind the foliage?
Nothing ventured, nothing gained my dear Wonky ... and remember, plants want to live, they don't want to die if they can help it, so it's on your side.
What you've got to have now is patience
Yes, magpies, jays and other members of the crow family bury food - and sometimes remember where they put it
Next door had two lots in their roof space last year - they caused no trouble at all and pollinated my beans a treat
Now I've seen it's a tree not a shrub that's my best bet at the moment, without seeing a better pic.
Possibly/probably Tree Bees - they frequently occuply nest boxes. They'll be gone by the winter. They're really good pollinators
Ah I'm not sure about my weigela now - I've blown it up a bit and can see a tree trunk - I couldn't see that before, I thought it was a shrub coming over the fence from next door!
We definitely need a better pic
I'm having to tinker and change lots this year, partly because despite yallow being very happy in my front lawn, two Achillea planted in the front border have refused to make an appearance this year
Possibly a goat willow seedling Salix caprea