In regards to WRAPS

I have read with much interest comments in regards to WRAPS/Rent to Buy.
A few questions for your reply-
a) what would be the average deposit for a renter to buy be if there is one or is it a case to case scenario 1)if they were a first home buyer how long before they could receive the FHB grant.
b) if the renter defaulted on their payments-1) how long for the contract to be terminated, 2) as there is a lease in place are you them obligated to see it through to the end or would it be terminated as per a standard lease agreement conditions, 3) is landlord insurance applicable.
c)is the contract deemed unconditional at the time the buyer takes possession of the property
d) is it possible to employ a real estate agent to carry out sourcing a purchaser and if so when would they get paid eg time of handover or final settlement
I am sure you have answered these questions before but its not always easy to find them in all the articles.
Thanks for your help
Adam