Santa’s hole in the ground

I did a bit of Christmas shopping yesterday in Covent Garden market. They have a big Christmas tree there – (and yes, it’s called a Christmas tree) – and next to it is Santa’s Grotto.

Santa’s Grotto is where little kids go to see Santa in the UK, there are grottos in stores, malls, markets, etc.

I just don’t understand why they think Santa lives in a cave. Santa lives here.