Where is the Post Office

Yummy Japanese beef, Sandy and I got really full just a couple of pieces of these highly fatty meat, Uncle Thomas had another 3 or 4 plates all by himself.
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I need to send out some document to my bank in Japan, trying to find the post office nearby the client which is right next to Bank of England. The building is certainly historical, but the interior sucks. I feel like the living maid in the movie Gosford Park, working in the dark mezzanie.

Anyhow, I quickly googled the post office near by bank station, keyworded "post office bank London". The result came very satisfactory, I am in 30 something Lambard street, and the post office is 10-15 Lambard street. I farewelled the group from lunch and walked toward the post office. The address numbering system is very confusing, the number jumps from 82 to 21, I started to have bad feelings. I walked the same segment of road up and down twice, I still cannot see the 10-15 Lambard. Desparate, I went to ask for direction from the newspaper guy. He didn't even look at me when saying "straight down". I kept walking on Kings William's road, very confused. I thought the post office is in Lambard street? A couple blocks passed, I gave up and retrieved back to the office, thinking I shall return tomorrow morning with clear idea where the post office is.

Checked on the google map the next morning (10-15 Lambard street is really hiding near King William's road side), I was all confident in finding it this time. However, failure hit me again. Frustrated, I went to the Pret-a-manger to buy a crossiant to cheer myself up (also wanted to ask where the hell the post office is). The nice lady behind the counter say "Post office? You have to walk toward Monument, it is right next to the Tesco". "But the google map says there is a post office on Lambard street". "Oh, that's the name of the road, Post Office Court!".