Is it rude to keep a reserved train table when a group wants to sit together?

Farah has laid out three postcards at her reserved table seat on an Edinburgh–London train when a man stops beside her. “Would you mind moving? There are four of us, and you're on your own.”

He points towards a single aisle seat farther along the carriage. Farah chose the table weeks ago because she wants to write to her grandparents during the journey. The group are four adults going to a birthday lunch; their reservations are scattered through the coach.

She says she would rather keep her seat. “It's only a table,” one of them says, and she starts packing the postcards before she has actually agreed to move. The man who first asked looks uncomfortable and says they can ask someone else.

Would you stay put, accept the offered seat, or ask the train staff to help the group find an arrangement? Farah is now more bothered by having nearly moved automatically than by the original request.