Supporting docs - 5 years visitor visa

I will shortly apply for a 5 years visitor visa. I've had a few other visitors visas of shorter length before (2 years). The application form is now online and you complete it online.

I assume the supporting documents they require are similar to those for the 2 years visa.

But do the supporting documents have to be certified in some way? For example, the bank statements and council tax records I supply? I read that they will now accept printouts from the internet, as most transactions are done online. But do the printours need to be certified?

I assume the printouts need to include basic nformation like the dates, account holder names, name of suppliers.

They have to not be older than a month old, is it?

Thanks.

How do I delete my post? I found the information today. Thanks.