Well only just returned to the forum after working hard on trying to get some answers. I had to check a few of my guesses on Dan Word and they were wrong, so I cheated (I hate doing that, but I'd no time today as I have to cook dinner, currently in oven). I got 24ac (on my own) which led me to 16ac and the theme, which in turn helped with some answers. I had to google 18ac and despite having all the crossers I cheated on 7/12. I've never heard of this actor and despite googling the name I'm none the wiser.
There are some I can't fully parse - no doubt covered earlier in the thread. They are 9ac (I thought this was going to be Mint). (I've just spotted the significance of detailed), 10ac, 13ac (I'v got two letters to account for), 2d - I've got the regularly deleted emails, but no idea where the Police chief fits in (It has just occured to me that this may be a reference to a pop star?). Finally, I have 14d, but can't parse it, possibly because I've no idea what the Big Star is either way up.
Like the rest of you I was much amused when the penny dropped with 8ac
So, LOI 7/12, COD 21ac
It took me ages to get on Brockwell's wavelength. I guess he is not my favourite setter. Sorry