Will a .co.uk or .com domain affect the way listings are prioritised in Google?

Will a .co.uk or .com domain affect the way listings are prioritised in
Google?

We are a UK based company; our site has a .co.uk domain which redirects
to our .com domain, recently though our Google UK listings have
completely disappeared from being on the first or second page, however
the Google.com listings are still there.

Would we be better off the other way around, ie hosting the site on
.co.uk with a redirection from the .com?

Many thanks for any help.