Why are fewer English people going to their local pubs for a drink? Are they aware that many pubs are shutting down due to lack of customers?

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Entertainment (pre TV and radio)

In the mid to late 20th century they added food, without the inconvenience of cooking it or washing up.

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Comfortable seating in a warm, cozy environment, or a nice pub garden

But now:

You can get takeaway or even cook yourself a wider range of food of good quality

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Back in the day (early 20th century and before) the English pub offered things you couldn’t get in a working-class home:

Your home has more comfortable seating and a garden

You can get a wider range of quality drinks at lower prices from a supermarket

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The pubs with the best chance of survival long-term recognize that they can’t just get away with the same 3 beers, ropey wine and pub-grub. Why pay more for something worse than you can get at home for less?

They need to offer either food of a quality you can’t get at home (true gastro-pub experience) or alternative entertainments - live music, poker nights, sports viewing etc.

A range of alcoholic drinks

What kind of person makes you think "how come there are people like that"?

You have to understand what the attraction of the English pub was in the first place.