anotheoldgit
You're going to hate this answer, but here goes.
One of the reasons why the show is striped across two weeks every night, is because of the difficulty in securing the number of soap stars to appear for a longer stint (a la 'X Factor').
The other reason is that ITV want something to hammer Celebrity Big Brother in the ratings.
Notice that ITV have scheduled the show in the same time slot?
I suggest you change channels to watch the excellent 'Planet Earth', currently being repeated on the UKTV History channel at the same time.