ILR delay — 8 months, 2 months past committed date — what next?

[waltercho]

Hi all, posting for peer opinions on a long-delayed ILR case. Grateful for any experience or advice.

Background
My wife submitted her ILR application (Set O, Standard, five-year settlement route as an Innovator Dependant) on 2 October 2025. UKVI's acknowledgement letter committed to a decision by 2 April 2026. That date passed with no decision and no explanation. It is now 31 May 2026 — 8 months since submission and 2 months past their own committed date. At no point has a caseworker made contact, requested further information, or explained the delay.

What we have done
We filed a formal complaint on 2 April 2026. Not upheld. The response acknowledged the delay and said the file had been escalated to the casework team with no decision date given. We requested a review; the second complaint response was also not upheld. That response directed us to send evidence of pregnancy to an expedite mailbox for casework team consideration.
We submitted expedite requests with supporting medical evidence on 6 and 7 May 2026. No response has been received to either. Our local MP wrote to UKVI in April 2026; her office has received no substantive response either.

Current position
Our baby has since been born and is a British citizen at birth. I am a British citizen, and other three children (born abroad) have co-pending ILR applications. My wife's existing leave is protected under Section 3C while the application is pending.
To summarise where the escalation routes stand: formal complaint exhausted, expedite mailbox submission ignored, MP enquiry unanswered.

The question
Given that the complaint route is fully exhausted and the expedite submission produced no response, what would you do next? Has anyone been in a similar position with a long-delayed in-country settlement application and found something that actually moved things forward?