Resume vs. CV for UK Jobs

I have a question for you London-based monkeys.

I am an American applying for a UK-based position and I am uncertain how to properly format my application. I have always used the one-page M&I resume template here in the States, but from what I gather on the internet, people in the UK mostly use a 2-3 page CV instead. Still, I've seen some atrocious USA resume advice on the internet, so I'm weary of trusting what I read for UK CVs.

First of all, is the use of a multi-page CV as opposed to a one-page resume correct for financial roles in the UK?

Second, if it is, is there a strong template out there that I can use to build mine off of, much like how many people in the US use the M&I or WSO template?

Third, are there local do's or don't that I should specifically be aware of? For example, in America, if you put a picture on your resume you're a clown, and there's generally no reason for a "objectives" section because everyone knows the objective is to get a job. I want to make sure I don't make any obvious cultural mistakes.

Thank you in advance for any help.