The force says “the photo is from our friends at Lancashire Police” and is “totally a joke”, it was just reposted by them in 2018.
Among the translations are “Stormzy = not the weather, rapper from Croydon” and “blud = brother; associate”.
However, Surrey has been called out for labelling the initial post as trying to engage with “our younger R&B residents”, since Stormzy isn’t R&B.