Start checking this thread
https://talk.uk-yankee.com/index.php?topic=100139.0 by mbmoffat
In short
1. Collect all your documents as per the thread mentioned. There's a few iterations on what is needed but page 8 has latest view
2. Apply at
https://www.gov.uk/government/publications/application-to-settle-in-the-uk-form-setm/apply-online-form-setm3. At 2 you can save and carry on to next section until you have all the data ready to go. And go back to start to recheck data
4. Once you're happy with all the data, plus you have all the documentation and scanned into pdf then there is a choice to do standard or ...more
5. Standard is £2404 and Super priority is £3204 BUT that option only appears at 1am BST !!
5a. So wait and do not Submit until you get the option of super priority. If it doesnt appear try next day.
6. Refresh before 1am and you see standard. At 1am you see Super Priority pop up. Select it QUICK! Submit the application.
7. You pay the money and then get a code for UKVCAS email to applicant
8. Follow the link in email to UKVCAS website to enter your postcode and find where Biometrics are available.
9. I think (experts will confirm) that only so many are release each night. So pick quickly, but dont rush it
10. Be sure to give yourself at least 3-4 days before Biometrics as you will want to upload your pdfs 2 days before Biometrics. And it's nicer to recheck the pdfs.
11. Biometrics. Take your passport etc and evidence/docs
12. After a day or so approval and ILR
We're at stage 10-11. Biometrics next weekend. Good Luck.
Experts here will know more to add.