Years ago I was lucky enough to buy a complete run of Punch, from the very first issue in 1842 right up to 1958. I was glancing through the volume for 1906 when I spotted a full page review for the first 1905/06 revival of "Peter Pan, written by "O.S." which I take to have been Owen Seaman.
I can't say I agree with him, particularly his dislike of sentiment oscillating with humour, but let me not bias the opinion of others. I O.S.'s favourite line = "a cry of the heart the most appealing in all of the play - Peter Pan's "Come away, Tink: we don't want any silly mothers." I can't find that line in any of the surviving versions of the play, can you?
Just search for "Punch 1906" in the database ...