[LDN]

referring to the purple…

twitter.com 

Well spotted! 

So this...

ibb.co 

...was indeed a rejected version of the titles, and was ultimately replaced by this... 

ibb.co 

...which is what we ended up with.

The wrong choice, in my opinion. The abandoned titles are still far from the most sophisticated of motion graphics sequences, but I think they're more visually interesting than the final product, and they demonstrate a bit more creativity than slapping a giant floating blue circle on the design and calling it a day. 

As @Keith pointed out, Chris Cook also said that it was "a mistake" for those titles to have been played out at all. 
twitter.com  

I understand that mistakes will be made (I've made more than most, I'm sure) -- but why on earth were those titles even loaded onto the system for playout? How does a title sequence not approved for broadcast, and already replaced by an entirely new design, end up on a server waiting to be cued for transmission? Is there no designated responsibility to check, and double-check, something as important as ensuring that the pres elements loaded and ready to go to air are actually the correct files? 

I would suggest that it seems less likely to be one person's 'mistake', and more a shared failure of procedure and oversight -- no-one checked; no-one double-checked; no-one made sure that any checks were ever carried out; no-one at any point thought to ask "have we definitely got the right files installed?"; and everyone eventually just assumed that the titles available to cue must obviously be the correct approved-for-broadcast versions. 

Still, nice to get an unexpected glimpse of the road not taken.