UK Based GTD users

I know this doesn't necessarily fit this posting board, but it does have to do with calendars. A friend of mine just got back from spending two years in London. While there, a number of his colleagues used a calendar that was pink in color (like the FT) and a number of others used one that was tan in color. He can't remember who made these calendars, but really liked them. His birthday is coming up and I would like to suprise him with one of these calendars. Any ideas on who makes them and where I could get one?

Thanks,

Amanda