I followed this kind of. I used ready rolled pastry (just because it makes it easier). I made double the amount of custard and it made too much (doesn't say on there what size pie dish to use).
I also seperated a couple of the eggs to make maringues with the whites. Also used less sugar and milk.
If you look at the comments they say to adjust the cooking time, and also the pastry on there doesn't work right.. so maybe use a pastry recipe that you know works well.
http://allrecipes.co.uk/recipe/23793/homemade-baked-egg-custard.aspx