Thanks to Brockwell. On the gentle side but with a number of embedded tricks.
My FOI and LOI were the same as rog's!
Two clues required GK over my head and the solutions had to be confirmed. I initially chose the wrong second word of 8, which had to be corrected. One sly misdirection, not mentioned to avoid spoiler.
Co-COD 14 and 19 because components of their solutions appeal.
Also enjoyed 27, 13, 24, 12, 20, 13 and 18. So I had fun.