Thanks for the help/info. All works well especially if it is 'mp4'. However, some are '.flv' extension. Where the whole file has downloaded I have converted to mp4 using Format Factory, but in some cases I have only downloaded (say) 1.7MB out of something in excess of 15mb. Does this simply mean 'tuff', and nocando?
Posting this again, in the hopes that those who might know the answer to number 5 might be home from work now! Sorry, but someone has to be retired - might as well be me!