@Robert Radcliffe have a look at this post where the history of Sirram, being a brand of Georged Marris & company of Birmingham is discussed. Regards John
@Jeopardy thanks that article, and subsequent links, proved very useful. One of my sets has the burner Rg 542349 dated to 1909.
@Robert Radcliffe. Two very nice sets Robert i can understand why you like the early Siram sets, i really do like the copper set copper all ways looks good polished or patinated, but finding a tinned set that has not rusted and in useable condition is just as good to own