The UK National Archives have some podcasts worth a listen. There's plenty here on how to search for ancestors with particular backgrounds, including ones who wound up in prison, the workhouse, or the circus.
There's also help on searching for people in certain locales, for example in Scotland, and discussion on emigration to Canada and Ireland, transportation to Australia and on immigration to the UK. There's even a podcast about UFOs! Plenty to choose from...
For people interested in South Africa, there is one on the "South African Empire"
audio Characters Chilanga Chingola Chipata Church Copperbelt External sites Farming Gravestones history Indexes Kafue Kitwe Livingstone Luapula Lusaka Malawi Mbala Mbereshi Medical Missions Mongu Mufulira Mumbwa Mwembeshi Nchanga Ndola Nkana North West Rhodesia Northern Zambia postcards Schools Scotland settlers Southern Rhodesia Southern Zambia Then and now Western Zambia