I don't think a K-1 receives anything until the case has been sent to the appropriate consulate. NVC simply assigns a case number to the K-1 case, then sends it to the consulate when requested (by the consulate).
It is way too early for a visa number to be available. PDs for 1 November, 2006 are just now current. Sadly, this is one thing which can never be expedited.
I don't read it like that. They are just quoting the regulation which says you must act within a year from date visa number is available. . They say you were previously contacted and you did not respond within a year. What is the I-130 priority date?
Is your Son married? Below is the Visa Bulletin for May 2026 showing dates when petition priority dates are becoming current. It's going to be a pretty long wait. Those petition priority dates shown are now current in May.
They mean the visa decision will be made after the interview.....London is going to interview the applicant and "process" the case. I assume you have a London DOS case number.