UK Take Away Fish and Chips - help!

Seen so many variations of the nutritional info.
From 500cals a portion to 1500 cals.
I'm talking an average size cod, chips and mushy peas.
The particular fish and chip shop I go to isn't overly greasy like some, or so that how it seems.
I'm going tomorrow so would like to know what people think, I've always put down as 1000cals.
Thanks!!

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