Last weekend was full of David Bowie on the BBC in 'Sound and Vision' (radio and TV) - most of which is still available on BBC iplayer, if you missed it.
One of the shows featured was a 'TOTP2', broadcast in 1999, that had a version of 'Under Pressure' I'd never heard before and certainly I'd not seen the clever video they'd created. 
This video was directed by DoRo Productions a film company based in Vienna, Austria and features footage of Freddie Mercury from the Wembley concert on 12 July 1986 and David Bowie at the Freddie Mercury Tribute Concert also at Wembley on 20 April 1992 spliced together by digital technology (and with Annie Lennox carefully edited out), it looks like Bowie and Mercury were on stage together.
It's quite a different mix (*Rah Mix © Dec 1999). I rather like all the phasing on the guitar - see what you make of it >

Or if you can't be doing with this version here's the Classic Queen mix over the same video footage - https://www.youtube.com/watch?v=YoDh_gHDvkk

*Taken from the 1999 Queen's 'Greatest Flix III' compilation.