There will be logistical problems with getting autographs on a CD. I am sure that most of the artists would be delighted to do this, but all the tracks were recorded independently and in two countries.
The UK launch would get most of the UK artists together, so we could get our end of the CD signed then. I don't think there is a US launch where the US artists are gathering, so that is a rather tricky problem for someone to come up with a solution to!
Mary