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12d "In principle, deposit children in custody of relative" 10,3 I have P???I?S??? LAW.
23d "Large organ's featuring in visceral composer's work" 9,7 I have ?U?????R? T???E??(5d 23 for one - in record form is "AUDIOBOOK" which may help)
29d "Wide, winding, long, empty interstate highway" 7,6 I have ??????G ???E??.
It is reassuring to learn that others are struggling; I thought from the lack of postings yesterday that it was only me! Hopefully these will give me some letters!

Gullivers Travels

Gawain if its any help 15across gives me Voter which gives you an r for the third letter .also i think that it is something ending in Law

Parkinson's law?

Spot on Rosalind

29d Watling Street

Ok well i owe you one.
I make 42ac asGrandstand Finish

Thanks all of you and sorry for the delay but I had to do other things this afternoon.
For the record I agree with Grandstand Finish.