The provisions for claiming Unused Material can be found here:

https://www.gov.uk/government/news/crime-news-updated-crown-court-fee-guidance-and-new-claim-forms

It applies to cases where the Representation Order is dated 17th September 2020 or after.

The provisions for claiming the sending fee can be found here:

https://www.gov.uk/government/news/crime-news-online-guidance-for-sending-hearing-fees-rollout

It applies to cases where the Representation Order is dated 19th October or after.