Update on the "delays" topic - and good news (sort of) for a change. I'll just post the timeline below rather than a paragraph of prose. As background, generally speaking, I've encountered a series of delays and mess-ups by SSA since April 2022 when I was incorrectly WEP'ed for receiving UK state pension (I wasn't due to start UK state pension until April 2023). This was refunded (eventually) but then I wasn't WEP'ed the following year, when I should have been, and this (not being WEP'ed) continued for almost 2 years.
Early February this year (2025), I realised I had not received my January 2025 SSA retirement payment, with no letter, no message or no other explanation. On checking my MySSA account, I saw that the January payment, and subsequent payments, had been "suspended", although there was no explanation why on the account.
A few days later, unusually quickly, I received a letter from SSA Maryland explaining that my payments had been suspended for not returning form 7162 (I had previously sent this form twice, tracked and signed for).
As above, I therefore sent a package of information on February 10th including an appeal form, to both FBU London and SSA Maryland, tracked and signed for. Again miraculously, the tracked letter was signed for at FBU the following day (February 11th).
On February 21st, I logged in to MySSA and saw that I will be paid for February (usually arrives on about the 3rd of the following month). No indication of when the decision was made, and no messages regarding it ... but bottom line is that the situation was sorted out (sort of, see below) in about a week!
Today (February 26th) I received a letter from SSA Maryland, explaining that, as above, I will be paid for February, and every month thereafter. It also explained that the January payment was being used to offset previous overpayments (WEP-related, connected with the 2+ years of previous errors and miscommunications). So, rather than pay the incorrectly suspended January payment, they are putting it towards the WEP overpayment. I still owe a few hundred $$, but don't know when or how that will be deducted (but have been assuming it has been skimmed off the top, so to speak).
Bottom line, then, is that SSA CAN work quickly when they want to. I don't know if the above was spurred by my letter being received by FBU London, or being received by SSA Maryland. I'm a bit miffed that they withheld a chunk of money, but pleased that my payments will resume next week.
When sending forms and communications to SSA, it may be worth sending to both SSA in the US and to FBU London.