Regarding research for the programmes, this week's Radio Times 21-27 August has an article on next weeks subject Alexander Armstrong (I wonder if he regrets that brilliant spoof sketch

Five months of research and they break down into weeks what was done and how they went about it, interesting to note that they used the internet source A2A, but mostly they went to the archive centre for whatever theyneeded, such as British Library and the National Maritime Museum and county Record Offices.
The filming was done in ten days, broken into two five day sessions.
It mentions that photocopies of all the information on events etc are collected along the way ready to hand to 'the subject' on screen.
This one is going to be going back a very long way, so a change from most of this seasons programmes.
Pat ...