Extremely straight-forward? Then what the next step would be, somebody from Home office brings citizenship certificate to you and apologizes for being late
Everyone is waiting! whether the spouse is British or not and their case is complicated or clear. And it is not a Ryanair flight with priority boarding. For instance in the last 10 months, I applied (or helped them in applying) for 7 different people (4 from my family and 3 other close friends). Including mine we received 3 certificates so far but other 4 (with extremely straight-forward situation) still waiting for the last min. 7 months.
Find something else to focus on, then one day soon (probably Monday morning) you will get an email from Altas saying "I am pleased to tell you that.....