Whisk the cornflour with a little of the almond milk to a smooth paste ... the mixture is smooth and has thickened to an almost custard-like consistency; this will take 10-15 minutes.
For the custard: Pour the milk into the saucepan ... Add the flour and the corn flour to the mix and whisk it really well. When the milk is about to boil, pour it over the top of the egg mix ...