Thanks Moby - I hadn't made the link that The Sussex Arms was a Big Smoke pub, even though I knew its owners were involved in setting up the Antelope. In that case, I'm going to assume the fourth pub is the Express Tavern at Kew Bridge.
In the interests of not completely derailing this thread, my POTM for December was
New Brew-M in Burnley - a top quality micro pub with great beer from Reedley Hallows Brewery. It put the town's more established ale houses to shame despite being absolutely packed full with home and away supporters on a busy match day.