I'm finding this thread really interesting. I do think you need to get off your high horse about critics on the thread. I have seen no critics, just people pointing out that you have a tough job on your hands and stating that worn tyres are an issue for the consumer to keep an eye on. You would be hard pushed to have a brand spanking new set of tyres put on and they be completely illegal within a week. Check your tyres regualr, end of. 7000 miles is not regular.
I also find it interesting how all the other non "critics" (if you still want to call the other critics) are all saying "yeah do it" when they are obviously agrieved about the wear issues but have chosen to do naff all about it for god knows how long. It is easy to push someone else into a no-win situation than sort it yourself. Look in other threads people are saying how wonderful Lexus are, yet in this thread they are no better than worthless, cheating, scumbags.
I wish you every luck with your persuit of this case, taking on the financial clout of Toyota is one hell of a deal and is gonna cost you big time. I hope something worthwhile comes out of it but for the life of me a cannot see it will. As has already been illustrated in the thread, the potential compensation that may arrise from this is huge, so the amount of money it will take in court to get you off their backs is pocket money in comparison. I just hope it is pocket money for you too. The comparison on battery life of a laptop is not the same, the financial implications to the manufacturer are/were completely different. An apology is one thing, a potential multi-million payout is another.
I thought your original letter to Lexus GB was good, however, I do think you earned the dismissive response you got back, as you clearly belittled them in your letter. Taking the ***** or trying to be funny is never good idea in prelim to a legal battle, you should've left the bits about wearing gloves out of it, I don't think you did yourself any favours.
Anyway, despite all that, I do wish you luck in this case.