In The United Kingdom
In the U.K. plate blocks are also commonly known as cylinder blocks and are widely collected as they still form an important part of the printing of current British stamps.
British stamps have also included a system of "controls" which were first used in February 1884 and continued until 1947. The "control" consisted of a letter in the selvedge of the sheet and was introduced as an accounting method by the printers due to the very large number of low value definitive stamps they were printing.
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