Thanks so much for the feedback.
Regarding the "consent to verification checks" form formerly used - I've completed the application online short of paying and submitting and the only required document listed for printing/signing is what they call the "relationship declaration" form for the sponsor to complete (
https://visas-immigration.service.gov.uk/documents/family_declaration.pdf - the link takes you to the "family declaration" form used in other applications, e.g., naturalisation). I'm going to assume I don't need to pull the old form I used for FLR when there is no link for that. Someone mentioned recently on another forum they submitted both forms for ILR but that doesn't make sense to me if there is no mention of a second form in the application (to be signed by either the sponsor or applicant).
My correspondence is spaced exactly 5 months apart, starting 5 months after my FLR application (May 2018), coming from over 3 sources. I had initially planned to cover only 2 years as that was the guidance I had previously read, but in the summary of the application it specifically says it needs to cover 2.5 years, so that's what I've done:
Oct 2018 - joint utility bill
Mar 2019 - joint council tax bill
Aug 2019 - two NHS appointment letters, each separately addressed
Jan 2020 - one bank statement, one NHS letter, each separately addressed
June 2020 - joint utility bill
Nov 2020 - joint utility bill