Dear Andy-
I am still going around in circles with trying to optain permission to use the images of the Rider Waite deck as illustrations in my novel... it's become quite the challenge!

I did contact Mr. Semken as you advised me to do , and I received a very kind reply back from him. To surmise his email, he advised me to contact Random House since they are the agents for his father's estate; he said he was sorry but he didn't know exactly which department to get in touch with.
I did have a look at their website and rang one of their numbers in London, but the person I spoke to didn't have any idea who I should contact or what I should do next. Not long afterwards this pandemic business started and so the legalities have all taken a back seat for the time being. For now I'm just going through and editing my book, but I do keep doing searches online for any more information. I'll have another go contacting Random House next week. In some ways I'd just like to throw up my hands and say 'publish and be damned!' but I think any publisher might take a dim view of that. Even self-publishers would probably be wary of being held liable for infringing copyright, especially with US Games involved.
I do wonder if a self-publisher might still be willing to print a dozen or so copies for me, provided I promised not to sell them? I have family members who are getting on in years, and I'd really like to be able to give them a copy... I don't want to hang about waiting until 2022 when these illustrations enter the public domain and leave it too late.
Anyway, that's where things stand at the moment- I'm still plugging away tidying the book up, sorting out my illustrations and double-checking punctuation. Even once all that is done, I still need to get it in the correct format for publication, so plenty to keep me busy. Mr. Semken said probate was due to be sorted soon on the estate, so maybe I'll have more luck with Random House the second time around!