I posted a few months back after binging them all in 2 weeks.
The Daniel Craig films are the only ones that have some sort of cohesive linked up story.
Then again, the original 'Q' was very familiar with Bond in the first Roger Moore outing which suggests it's meant to be the same fella. (as he was with all bonds until he was himself replaced.
I guess the choice of the next bond (a person of colour) or even a lady (Jemima Bond?) would put the debate the bed. (read that last bit in a Roger Moore voice if you like

)