After sending an email to request permission to host a website dedicated to the discussion of the exercises in 'The Road to Reality', this is the reply I received from Roger Penrose:

I am perfectly happy that someone or some group of people set up such a website, but it would not have any "official" status as far as I am concerned. I would not be prepared to "check" any proposed solution or solutions, nor would I even be likely to look at them. I apologize for this, and I fully appreciate the frustration that readers may feel about the extreme delay in my setting down my own solutions, despite my initial promise to do so in the book.

Perhaps the proposed website would have the effect of spurring me on to put my own solutions on the "roadsolutions" website (and to pointing out one or two remaining misprints and errors of intention in the exercises). I hope so, but I still find that I have little time in finally getting down to it all.

I am very happy that the above message be forwarded to Shaun Culver, together with my respect, my apologies, and good wishes for what he proposes to do. I also very much appreciate the fact that he has indeed requested my permission that he host an internet forum in the way set out in the message below. I am happy to give any such permission that may be required but as I have stressed above, I take no responsibility whatever for the correctness or otherwise of any of the proposed solutions, nor do I commit myself to looking at any of them or providing any judgement on them of any kind. In short, the forum would have no "official blessing" from me, and would be an entirely independent endeavour on the part of Shaun Culver, or of whomever else might be agreed to be involved in the project.

Roger Penrose