I can tell you that when interviewing many years ago the 30-page full-colour with photos CV did not go down well. I don't think there is anything wrong with 2

I can tell you that when interviewing many years ago the 30-page full-colour with photos CV did not go down well. I don't think there is anything wrong with 2 or 3 pages of CV for a (UK) tech job application, but getting it all on 1 (or 2) shows ability to summarise and get key points across efficiently. And the intervire team may have many CVs to read. And if you used to be CEO at a famous multinational, or run a country, you don't need more than one page.