Interesting. I have been trying to find JOHN BROWN born 1811 in the death indexes on Scotlandspeople for some time. No joy so far.
Last known in the 1871 census in Lanarkshire. He doesn't deem to be in the 1881 census . I reckon he died in between the 71 and 81 censuses in Lanarkshire.
John was a coal miner and is wife died pre 1871. I've seen this death certificate.