I'm really pleased with these new methods and now don't feel so daunted at the thought of making a larger project with lots of smaller medallions - if I don't have to stop to sew ends in all the time!
Please do let me know if you find the pictorials useful.
Update (March 2015): I have been asked for the link to this pictorial a few times which I thought had been lost (changes to Flickr where it was hosted). Luckily someone had saved it and it is still viewable. I am adding a caveat: on a couple of occasions, my tatting came undone after using this method so I had initially removed it because I didn't want to be blamed if anyone tried this method and their hard work fell apart!! So please feel free to try it and see if you feel comfortable with it and make sure you are happy your tatting is secure!