I haven't received the letter yet either, just have the pdf that Mark posted on here last week. It does state that cars up to the end of 2013 are affected.
Thanks to all for the good wishes and expressions of horror. There will be discussions behind the scenes over this but the nature of it is that these can't really start till Mark Evans gets back from holiday. I hope he is having a good break so to speak. laugh
What is probably most surprising about this is how little effect it has on the handling on the road! Presumably the main loading on the tube is compression at the break so it mainly holds together even once mainly or completely severed.