Finished upon resumption.
Definitely a challenging Prize, but worth the effort.
FOI 4
LOI 13
Some UK terms required Google to confirm.
Many great clues and difficult parsings.
My COD also 19, narrowly over 5d, 20 and 27.
Also liked many others including 17, 2, 9, 25 and 11. A clever Spoonerism as well.
Thanks to Vlad, who's contributed some impressive Prizes of late.