your site http://swanston.maui.co.uk/pws/ shows differently at my place with chrome and FF. I think the height has to be adjusted to fit.
Script w34_index.php line 261 reads now
<img src="img/weather34logo.svg" width="40px" alt="https://weather34.com/homeweatherstation/" class="homeweatherstationlogo" ></a>';}
change the height to 30px so we can see if that solves it.
<img src="img/weather34logo.svg" width="30px" alt="https://weather34.com/homeweatherstation/" class="homeweatherstationlogo" ></a>';}
Wim
