Regardless of where you apply for a Swedish passport/id-card you can choose to pick it up at the Embassy in London, or at one of the consulates around the UK, when it is ready.
You will get an automated message via e-mail/text once your passport/id-card is ready for collection. Bring your current passport/proof of identity and your receipt. If your current passport has expired, bring another form of valid photo identification.
Passports/id-cards for children under 18 are to be picked up by a parent or guardian with valid identification. The child does not need to be present at the time of collection.
When you apply for a passport/id-card in Sweden or at another Swedish Embassy, you can ask to pick it up in the UK for a fee. Notify the passport issuing authority of this at the time of application. You can contact the passport authority and ask to collect the passport in the UK after the application has been made, but this will mean a delay.
You do not need to book an appointment to collect a passport/id-card, but you do need to attend during the specific visiting hours.
If you apply for a passport/id-card in or at another Embassy but wish to collect it in the UK you must first, at the time of application, state the Embassy in London as the place of collection. Thereafter, you may e-mail the Embassy and inform what consulate you wish to collect it at. See fees here.
The consulates generally require that you book an appointment before coming to collect a passport/id-card. See contact details at the bottom of this page.
If your application is complete, the processing time is approximately 2-4 weeks. The production time varies, more information here. If a longer time has passed and you have not gotten a message, check your junk mail before contacting the Embassy.
If you have Pre-settled or Settled Status and change the form of identification to which your residence status is connected, you must notify the UK Home Office. Questions about this are referred to British authorities. More information here.