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They eventually signed a deal with Panic! - the publisher behind mega-hit Untitled Goose Game, which cast players as a wildfowl on a mission to cause havoc in a small village.

The Shaftesbury estate owns the lough bed and the soil, the banks, the rights to sand extraction and shooting licences for wildfowl.

Ms Eaton said she believed the birds should only have been moved by an organisation with experience of handling and relocating wildfowl.

"And a lot of lead gunshot falls into the environment and it can then be eaten by wildfowl and terrestrial birds and cause poisoning."

Diesel spilled from the train into the Loughor Estuary, which is home to wildfowl and wading birds.