It's worth mentioning that @magpie patrick and I are (in parallel) doing the same with the Ian Moss Collection (as it's formally known). Dad left around 50,000 slides, of which perhaps half are of RCHS / ROMA interest. Unfortunately (for us) Dad's memory was excellent - Three months after leaving home on a stretcher, he was asked to give a lecture at the Care Home where he was now a permanent resident. Without hesitating, he gave myself and @magpie patrick a list of which boxes of slides he wanted such as "Green PVC case No 126, capacity 200, probably in the Dining Room".
The knowledge died with him. We've so far scanned around 33,000 slides - about 17,000 to go - none with meaningful captions. We're working with RCHS / ROMA as to the technical feasibility of having an Album (within ROMA) or a standalone website "The Ian Moss Collection" with 25,000 uncaptioned slides and asking for public help. Picking single slides and posting on either CWF or Social Media is simply not scalable.