Ok, so I think it was a conflict between the formatting of the USB thumb drive not accepting the video files. The Mac is a Macbook Air and there just isn't enough space for me to play with 1.5 gigs of video currently.
So I've taken the iPhone to another PC (not mine) and the files play fine. They uploaded to YouTube as .MOV fine.
Daggeteo wanted to check I hadn't recorded anything sensitive from his pool data, so he gets first view. Personally I see nothing amiss. I almost stumble in on him typing his password which was amusing, aside from that there isn't an issue. He's briefly on screen for a millisecond, so his choice...nothing distressing or embarrassing.
Getting audio files off the iPhone is another headache entirely.
So lucky Daggeteo recorded audio separately. Mine is clearer, but anything over 8 minutes I cannot email. In iTunes I can see two out of the three voice memo in the 'on my iPhone' tab, click sync voice mails, nothing. Apprehensive to try pairing this with another computer as everyone I know has experienced total loss of all music and playlists doing this. Not risking loosing the audio. Incidentally the file that doesn't show on the computer, all though present on my iPhone, doesn't play on my iPhone. It was about 40 minutes long and it was the recording that stopped unannounced during the open-day. The other two files play uninterrupted. So again, lucky Daggeteo had a recording device present! There are additional bits on mine Daggeteo's doesn't have, but I need to have my iPhone plugged into a paired device to transcript. Joy...
This faffing around has cost me time, and is the reason there's been some delay. I have to head out to work now, if Daggeteo can give me a heads up by tomorrow. I shall share the video...
For what it's worth Apple has always been problematic with sharing large recordings made on iOS devices, they really need to address this!
On the plus side...it's in 1080p!!