It took quite a lot of trial and error to try and get on Brendan's wavelength in this "letter" themed Prize by my namesake and, to be honest, I'm not sure I ever completely managed it.
Quite a few clues required visits to Google to see who was who, like Dombey and Son in 1d, the Nymph in 10a and what the Screwtape Letters are but, as I've said before, I always enjoy learning new things so that's no problem.
If you do get stuck there is at least one anagram in the acrosses and one hidden in the downs.
I still haven't properly parsed 8a and 25a.
COD - A toss-up between 13a and 19d.
Thanks to Brendan for a challenging workout:-)
I look forward to reading how others fared and, don't forget, if, like me, you run in to problems, just post your query on here.
Stay safe:-)