I'm not a Pub person myself, but I do have a Theory behind Pub closures, and it goes something like this...
I think the Government want people to stay at home in the evenings, it's far easier to control people in their own homes than it is on our streets, It's a far cheaper option all round.
I can buy a bottle of Wine for £3.99, I'd need a lot more money for a few drinks down the Pub.