If you say so. I am on retirement, I go there with appointment, TM7, bank letter, overstay form, STM2, passport copies. I spend maybe 2 minutes with the officer checking my documents and I am out with my extension stamp. I do need an extra stop at the bank, but it can be done on the same trip.
From what I read, marriage extensions need extra map, pictures inside the house, sometimes they come to check themselves, and you are under consideration for (a month?) which means at least two trips? If you live some distance from Imm it's not quite fun.
From what I observe, marriage "extensioners" always take double or triple time with the officer because the IO chats with the wife, then the wife translates to the guy, then the officer repeats to the guy, then the guy disagrees with the wife, then the wife chats with the officer...
Ret requires double the money, but Marriage requires a wife ????