Thanks for the replies guys. Must admit I'd forgotten this subject had been raised before.
I appreciate that the 'problem' is initiated by the aircraft box and I'm personally not really concerned that sometimes there's a batch of entries as in the examples shown.
I suppose some users are though and as multiple entries are logged in the relatively short time such flights are being picked up by RB, generating the log based on the ModeS code rather than the Flight ID within the inception to time out period would eliminate the problem.
Maybe not really enough of a problem to go to the the trouble of modding the software, - just an idea.
regards,
Syd