Blue Stickers??

Hi,

Have been looking at some timelines and not that there has been a delay between an application being approved and Blue Stickers?

Could someone explain to me what they are and why there is a delay if passports have been supplied with an application - can't they simply add a blue sticker then?

Bel

Once the applicant has been told their application has been approved, they have to pay the Migrant Levy before they're entitled to have the visa (blue sticker, which these days is more green!) stuck in their passport.

Thank you!