Fitzrovia 6,5 here...

More treasure. What's striking about today's find is its modernity in contrast to the reports shown in my post Holborn 6,4, please, which pre-date it by just one year. 

It's designed! The posterised cover and the use of a sans serif on a GPO document is a real departure. It's also a fudge, since the innards are exactly the same as the earlier reports. Given that the big story of the day was the opening of the Post Office Tower in 1965, one suspects that someone had pointed out that this modern, brand-spanking new marvel needed to be represented as such and that a little consistency needed to be brought into the equation. 'Let's see what those bearded weirdies in commercial art come up with, what!'