With a slash and without a slash

[onlinemediadirect]

I have noticed recently on open site explorer that pages are listed that contact the ending / and that dont.

so for example- www.onlinemediadirect.co.uk/blog-setup

and

www.onlinemediadirect.co.uk/blog-setup/

They also have slightly different page authority. Is it worth setting up a redirect or does google not need this ?

The page ranks well of course.

[oznappies]

It is work having standardised endings via a url rewrite or 301 redirect. If both exist Google will flag it as duplicate content, which you will see in 'html suggestions' in webmaster tools. Since it is classed as duplicate (as if different case - upper/lower) the link juice will be split between the variartions.

[KeriMorgret]

You do want to set up the 301 redirect. Ideally, you want one and only one URL for each of your pages.