My thought process has packed up !!! However, your thoughts for 30 are along the lines of "assault and battery" or battering, but I do not see the relevance, with respect. I still favour "roasting" as an anagram of organist, which fits with the "loose" Christmas-themed answers) and wonder if this is another letter count error by the Quiz-setter.
Thanks for confirming the Neil Diamond connection with number 50.
Have you any hints for 42, 48, 55, 61, 68, 72, 73, 79, 84 & 86, please. (Did not realise I still needed so many, but am now off to my bed)