Help Me Identify This Insect

[eien_herrison]

Hi everyone,

I've been relatively busy in my garden and have a lot of things planted up both inside and outside, and am starting to see the first shoots of various plants.

( Description of problem + picture )

I would really like to know what this is, where it's come from (if possible as I suspect the bark might be the culprit), and how to get rid of them (ideally with as little harm to anything else, especially as my cat has taken to eating some of the plants we've got). Thanks for your help :)

Edit: I'm in SE England, just on the outskirts of London city.

Edit 2: They're thrips.