We hope at some point in the future to bring this into our software, but for the moment, please see the following links:
OS Street View - This a link to the full User Guide from OS
OS GroundRanger - There is no published symbol list for the GroundRanger maps. These are very simple maps that do not appear to have any symbols that require interpretation. For road and rail features base your interpretation on the OS 1:50,000 legend
IGN 1:25,000 - this is the full text of the IGN Scan 25 document as the legend is not consistent across all sections of mapping so it has not been possible to attach only the relevant page(s).
OS Vector Map Local Colour