Attached below is a Collector's Time Line as an Excel file. It's available to download and then modify as you wish. It uses a simple macro to recolour cells the correct colours. You can still view the timeline without macros but to gain full access you should click 'enable macros' when prompted by excel.

It is in its infancy, as it is expanded the file here will be updated. Please add your comments and corrections below. If you would like to contribute to the Time Line and help with future versions please email g.atchison@kew.org