Help with removing the sort form the plan

Im trying to remove the sort from the execution plan. Unfortunately i cannot change the schema but i can change the indexing.
I can provide existing indexes if required, otherwise im happy to put a brand new index on if it will solve this issue (reporting database)

Thanks

EDIT *
New plan attached with cut down versions of the tables and create scripts including data. Ive added the index definitions that the plan is using. If there is anything else that would help please let me know and i will do my best to provide it (gov department and they get concerned with posting too much information)
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