This is another of many British Gas spots I served as a character animator on for Hornet Animation in NYC a few years back. I also did character design for the Girl and for the British Gas Guy in this spot. This one was early on in the series as many of the backgrounds and props were all practically-shot models. The planet rotations and the bike Girl rides on are all practical models. Later spots, like previously posted "Surprise", used CGI for backgrounds and elements.
This version is missing the voice over. Not sure why my copy is missing that track, but alas...there you go.
Character animation was done in After Effects. Additional character animators on this spot were Mike Luzzi and Zoya Baker.