The potatoes look very happy now — that top-up has clearly triggered them. I’d leave them alone apart from watering and maybe one more light top-up if stems show.
The courgette, though, looks like it is suffering from stress rather than hunger:
- too much wind
- being moved around repeatedly
- still relatively cool nights
- possibly a bit too exposed in that open pot
Courgettes like warmth and consistency. I’d stop moving it about now and give it a settled sheltered spot.
Best thing to do:
Put the courgette pot tight against the warm wall, ideally partly sheltered by the potato sacks or larger pots, but still getting good light. That blue pot looks wide enough, but the plant needs warmth more than anything now.
For the next week:
- Don’t feed it yet.
- Keep compost just moist, not wet.
- Protect it from wind with mesh, fleece, a plastic crate, or even a few canes with netting around it.
- Remove only leaves that go completely yellow and limp.
- Let new growth tell you how it’s doing.
The pale yellow leaf is probably older stress damage. The important bit is the centre. If the centre starts pushing out greener new leaves, it’s recovering.
I’d also be tempted to put the dwarf beans in the warmer sheltered gap near the potatoes rather than out in the open. That whole wall-and-potato-sack area is becoming your little warm microclimate.