spouse visa- service centre in london to scan documents?

RE- Spouse Visa - Settlement

hi ,

can anyone let me know the address or link of the service centre where i can go to get my supporting documents scanned and uploaded . i have all the documents with me , required as per the checklist.

online payment has been made for priority spouse visa application , and the applicant is in home country ... as far as i know applicant will only need to go in for biometrics with the passport in the applicants home country.

sponsor : british citizen
applicant : non eu national

Thanks for Help in Advance