Who is HE?

Shortly after Grand Designs aired a visitor to the site by the name of Square Eyes commented on the cbox about the mysterious man in the green and white suit at the end of the episode. He only appears for a short while and talks to Timothy Jackson (The Security guard) but they wanted to know who he was. So here are a short selection of stills taken from the episode to wet appetites even further. Unfortunately I can't reveal his identity but thought it might be fun to post this and attempt to stimulate some conversation and theories.