Thank you all for you continued thumbs-up on the project.
We are now up to 25 'sold'!
As promised, here are are some drafts of the ID I have been working on.
I have done a number of variations on a theme for my own ID.
It all looked somewhat plain until I added the TM logo as a background watermark (blue in this version).

TM Lanyard ID GaB by
Glenn Barker, on Flickr
I have also done, with permission, a fully worked example for Peter J.
There are two variations, in both text and watermark shade, and both could be kept in the final version.
The text can be edited according to your personal requirements.
This is my preferred layout (and keeping both watermark shades).

TM Lanyard ID Peter J by
Glenn Barker, on Flickr
The final kit will come with four inserts (three spares). You simply fold them in half to provide a double-sided ID.
And you can always photocopy the sheet to ensure you don't run out in future.
Originally I had the ID on one side only, until I showed it to someone on the blank side. Doh!
Let me know what you think!