Florienseis at Fantasy Book Review, who wrote favourably about Apartment 16, has come through with a very positive reaction to The Ritual at: http://www.fantasybookreview.co.uk/Adam-Nevill/The-Ritual.html.
Black Abyss gives a much appreciated 4.5 out of 5, calling the novel “another excellent spine-chiller” over at: http://blackabyss.co.uk/2011/04/the-ritual-by-adam-nevill/
I thank them both for their time and thoughts.