Huzzah! Thanks, Yigit.
**edit**
Hi Yigit,
I thought this worked, but it doesn’t.
I edited avia.js, but the logo is now back to the original small size when I visit test.bradcapland.com.
It only increases in size when I refresh the page. I have cleared my browser’s cache, the WordPress cache and have tested this in Chrome and Safari.
Is there somewhere else I need to edit the code?