It is a fact that, by 2063, white British people will be a minority on current trends. I don't think anyone disputes that.
Notes from Wikiquote
The author of the report, Matt Goodwin, disputed Robinson's interpretation.
Quote text and notes from Wikiquote: Rupert Lowe (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.