Moved blog to own space- text wrapping issues

I hope someone can help me.

I have recently moved my blog from https://ombeve.wordpress.com to https://ombeve.co.uk/blog, using v2.6 of WordPress

All went smoothly, but I am left with a really annoying issue.

Despite the html code being identical, all my nested images with text wrapping around them are now broken, so the text starts under the picture. Example:

OLD: https://ombeve.wordpress.com/2008/10/05/vale-progress/
NEW: https://ombeve.co.uk/blog/2008/10/05/vale-progress/

You can see, the new one looks awful. I want the wrapped text back! There is no difference in the HTML code, as you’d expect as it’s a direct export/ import, yet it refuses to play ball. Any new posts I create have the same issue. Can anyone please help?

Thanks in advance.