I picked up a bunch of Cthulhu Britannica material in a Bundle of Holding sale a while back. Glad I did, since Cubicle 7 has pulled the line after their license expired. As a sort of a warm up exercise for my efforts to write more, I started working through the original book to convert the adventures into Trail of Cthulhu.
It’s unclear how many I’ll get through, but I had an excellent time converting the first scenario, Bad Company. The work necessary to understand and adapt the scenario turned out to be a great way to internalize the material. Wish I had a good place to run it; alas, it doesn’t fit into my current campaign.