Climb out speeds
Piper Warrior Pilot, different instructors will recommend different speeds because a variety of different speeds can be used. True there is only one best-rate-of-climb, but that doesn't mean you can't climb at another speed, perhaps with good reason. For example, a higher speed will result in better forward visibility.
The important thing to remember if you are working towards your PPL is that the examiner will ask you, during the briefing (i.e. before going flying), what speeds you intend to use for various stages of the flight (others include cruise, downwind, approach, etc.). They (or you) will write it on a form and then check that you actually use that speed. As long as the speed is a reasonable choice (like 80knts in a Warrior) and you stick to it roughly, you'll be fine.
Despite the availability or otherwise of CAP 413, book 7 of the Trevor Thom series will get you through an RT exam - it's all in there.