I did a Google (other search engines are available) and it looks like code highlighting and completion of AHK in Notepad++ is a mess!

Various xml language files floating around, but nothing official.

A lexer plugin that hasn't worked since Notepad++ 5.7 (current version 6.1.2)

Please someone tell me that a neat solution exists?
 Or do I have to use a different app to write AHK scripts?

JoTo: This seems to me to be a slightly different issue... earlier versions of the player did the following when playing a playlist with autostart enabled...

Play Video 1 > Display Preview Image of Video 2 > Play Video 2

This caused a nasty flash as the preview image was shown for a split second.

5.9+ do it correctly...

Play Video 1 > Play Video 2

But there is still a delay (though no flashed image) as Video 2 will not start to buffer before Video 1 ends.

The personalised section breaks the 4th wall and talks directly to the viewer by name (also mentions their job title).

All the sections are prerecorded since she knows the recipient's info.

It is important that the sequence of videos runs as smoothly as possible... a gap of a fraction of a second might be acceptable, but anything more (waiting for the 2nd or 3rd video to buffer) would spoil the effect.

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My host is DreamHost and I notice that they have a licensed version of JWPlayer available to all their customers. I see that this accepts playlists as input, so might be able to use this as a solution - but only if the transitions between videos are essentially seamless as described above.