Encourage these beautiful creatures to your allotment, and you will also attract birds.
You may find ladybirds indoors in the winter, as they want a dry place to hibernate. They cause no harm, and make easy pets!
This just shows how much damage we have inflicted on insects – avoid sprays (and don’t drive!).
Mulch, mix the species, choose plants that will attract good insects: here’s links to some I mention;