Am I within my rights to demand a refund on a trip to Nepal?

Q. In January, I booked a trek to Everest Base Camp, due to depart next week. I bought it through a local operator in Kathmandu, and organised the flights separately. The agent/airline has refunded most of the flight, keeping £200 of the fare. But the operator says the trek is going ahead, and has refused a refund – only the chance to postpone the trip. What are my options? Name withheld

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