We have a Sea Pie in our family too. It is not one of the fancy ones with six layers of different meats, but a slow-cooked dish appropriate for a family where everyone worked.
The main ingredients are dried peas (soaked) and minced beef, with a suet crust.
I've written the recipe down, and you can see it at:
http://www.andrewalston.co.uk/recipes.html#SeaPie
