OK folks - it now is working!
Firstly, many many thanks to everyone who has taken the time and effort to post and help this guy who can write software for 25 years but still not be up to speed with the latest technology - my excuse is that it is not my area of expertise!
What I did was (using previous postings on this thread):
Started ITV player, selecting the match that I wish to download.
The relevant page for the match appeared on the screen but paused waiting for the START command to be selected (*)
Copied the URL for the game from the site address - NB I did not start the player at all at this point
Ran
RTMPexplorer, which started RTMPSRV alongwith it
Entered the copied URL into the RTMPEXPLORER address field and selected GO
The match's video site loaded in RTMPEXPLORER, exactly equivalent to the point (*) above
Within the RTMPEXPLORER main screen, started the playback of the game by selecting the START command on the screen within RTMPEXPLORER
Handshake traffic appeared in RTMPSRV box
Waited until audio/visual playback occurred in the RTMPEXPLORER screen - this is important.
Killed the RTMPEXPLORER dialog.
The RTMPSRV box merrily continued to download the file, appearing in the directory.
Waited until the download finished, renamed the file and repeated ad nauseam with the other matches that I wish to download.
Points to note:
KSV's COMMAND.BAT option seems to cause 'problems' - but I *do* like the idea that someone has taken the time and effort to produce a user-friendly output file - many thanks to KSV for this. Using his version of RTMPSRV and RTMPDUMP *does* produce a COMMAND.BAT file that can be edited to extract the relevant download command for the stream. However, running this *as a* command file causes the server 6/9 problem detailed elsewhere in this thread and the command file stops. The steps detailed at the head of this posting do not cause the download to stop so it may need a sequence of "on error, ignore" type statements in the COMMAND.BAT for progress. However, this is a minor point as the download can be done using the methods described above
Secondly, the playback (usually) has connection problems via RTMPEXPLORER, with messages in the RTMPEXPLORER screen indicating playback problems - well, it does on my (supposedly) super-fast broadband. This does not stop or prevent the download from happening but it does cause the whole process to take about 10 times longer than it should. Again, not a real problem, just an annoyance. (As a corollary, if the match playback starts smoothly without this playback problem message, you can still stop the RTMPEXPLORER process and the download takes next to no time and even the display in RTMPSRV looks smoother without terminal overwrites the whole time)
So, all in all, I am now a very happy bunny. Have started to download all the games of the World Cup - yes all 40+ of them. So all I need now is a large external drive for backup, time to edit the games for analysis purposes for my presentations, and many cups of coffee to help me through those processes!
Again, my heartfelt thanks to all involved