Man arranging meeting

Overheard conversation on mobile*

"I'm in central London, in a big field next to the House of Commons - yes a field, honestly.
I'm standing beside the largest, weirdest, multicoloured drinking fountain you have ever seen. You can't miss it. - no, I am not hallucinating.
It's near the Burghers of Calais - no it's not a McDonalds.
I'm wearing a blue pullover..."

* some of this may have been mis-heard, but I am pretty sure about the blue pullover.