Sorry I should have explained that the difference between the two images is the postcode - it should read TW11 not TW1.
It's showing TW11 when I look at it. :-)
Probably your browser has just cached the wrong version. If you do a force reload then hopefully it'll show the correct one.
A common solution to preventing this happening is that instead of replacing the image, add a new image with a new URL then change the page to refer to the new one. That way all browsers will be forced to get the new one rather than showing a cached copy.
Thanks
Joe