If you have lost ancestors in 1819 you might well find reference to them amongst the correspondence relating to the 1820 settlers to South Africa at the National Archives in Kew. Nearly 20,000 people applied to go on the government aided scheme, only a fraction of whom were accepted, but the letters from those who didn't emigrate contain a wealth of family history information as well as a great insight into conditions in the UK following the Napoleonic Wars. I have been photographing all the letters and transcribing them at home with the help of volunteers from the SA Rootsweb list. So far we have A-E online at

https://www.genealogyworld.net/settle...nce/index.html

but it is worth typing in your name interests into the Find box as the 1820 scheme required people to go out in 'parties' with at least 10 able bodied men, and there are numerous lists of names and addresses of people wishing to emigrate contained in the correspondence of the person who applied to take them out. Often vicars or overseers of the poor wrote on behalf of large groups of parishioners who would otherwise be liable for poor relief.