As a Brit & mentor, but not a teacher, I would suggest that you give the book concerned one last glance as you file it under WPB (Waste Paper Bin).
The examples that you quote are totally incorrect!
The "p" in "script" and "tempt" IS pronounced.
The "b" in "describe" is pronounced as "b".
The "d" in "wide" is pronounced as "d".
- For Teachers