Updating pages with theme

Hi there,

Thank you for your reply the other day. Very fast and appreciated.
On a similar issue, I have updated my theme template (both front page and single-page) but none of my pages are updating to match the changes. I am unsure how to apply this update and I don't really want to go to each page again and rebuild!

Please help me Obi Wan. You're my only hope.

Shaun