What is this and how do I get rid of it?

[MintToBe]

I live in freezing cold Scotland and brought my lillies, geraniums and fushias inside for winter. They are in an outbuilding wrapped in bubble wrap to protect from the frost. I've just gone out to water them and have found the fushias and lillies are covered in these.
What can I do about them?

Sorry. Forgot to attach the photo!

Sorry. Forgot to attach the photo.

Are they white flies? I'm not sure but they look like it. They feed on the sugary sap from plants, and are a massive nuisance. Really hard to get rid of.

If so... can I reccomend you burn them 🔥

We got them on our houseplants. I've tried diluted neem oil (worked on some things but not others, bizarrely). Can't remember the quantities but I'm sure Google would know.
I've also been told that apparently if you boil garlic in a bit of water then spray that over the plants that gets rid of them.

If they're going into the garden they'll get eaten by predators though, so once the chance of frost has gone I'd leave them to nature

RHS page on Whitefly

Thanks. There's also a massive spiders nest in the lavender so I think burning down the outbuilding and moving is the best option.😆