What’s the big mystery with the module 4? The info is in the Goods Vehicle Driving Manual. The load restraint question will consist of a description of an imaginary load and the candidate then needs to select the appropriate load restraint, demonstrate the use of it and undo it again. The choice is between rope, strap, chain and loadlock bar. The examiner WILL NOT tell the candidate which one to use.
The strap may well be dismantled before the candidate sees it.
Hope this helps 
90 days access to our training website for module 2 (case studies)
Module 2 test fee
Module 2 arranged for the candidate
4 hours training specifically for Module 4 (practical demonstration test)
Comprehensive handout from training session
Module 4 test fee
Module 4 arranged for the candidate
Use of appropriate vehicle for Module 4 test
charge for all the above is £200 incl test fees and VAT as applicable.