People are extremely peculiar about this.
It's a perfectly normal thing to expect to inherit from your parents. It's happened throughout all of history and in some countries, you can leave small bequests elsewhere but it's legally expected to leave most of your money to your children (Netherlands for example).
Inheritance is about money, but it's also about being part of the family and belonging and sometimes about getting things you've grown up with and loved, like furniture or jewellry.
Having said that, it's wise to be aware that yes in England a second wife might get the lot.
Is your father the sort of man that you can have the conversation with, in a calm and decent manner? It's a minefield this. In particular if there are a few physical objects you like, it's worth asking that they could go to you. But ... best tactful face foreward!
It is wise to get your head around the idea that you might get nothing though. This is my situation and it hurts - not so much financially, more because I am no longer part of my adoptive father's family and he's given away some things I would have truly loved to come to me, in time.