I would agree Brown will not value the special relationship as high as Blair.
As most of you know I did not care for Blair and Brown IMHO is worse.
Whilst I may not agree 100 per with Cameron I consider he would value the alliance between the 2 countries higher than Brown will.
Brown is forced to support the US on Afganistan and Iraq until our mission is considered complete but I do not expect much new support in any other areas.