One of my favourite posters on the Guardian BTL posted this.
The best way to protect your culture is to go out and do the cultural things you like.
For England: join in church raffle to raise funds to fix the roof, go to the village fete, teach your children to cook traditional English food, support bands playing in your local pub, watch the local cricket team, watch the am drams, go to the panto, take up moris dancing, whatever you think is good about English culture. Similar for Scotland.
Don’t just complain that other people have cultures they want to celebrate. You’ll probably find a lot of immigrants want to experience English/Scottish culture as well as their own.
Ed West is London-focussed, and doubtless not particularly hard up. How much is there in London that he could go and support? As Stephen Bush says, go to Wigmore Hall.
I remember Darcus Howe talking to some white British people in a pub, and playfully observing that while their baguettes looked nice, what was wrong with the traditional English ploughman's lunch? If you think this sort of stuff matters, which I don't really, it's not immigrants that forced the change to baguettes.