Still wrestling with getting a decent size image onto the blog page! This is an improvement, but still not what I really want!
I discovered that the Mac and PC versions are different! The PC version has a edit html button when you create a new post where you can make all the necessary html codechanges - I use a Mac and the Mac version doesn't have that button!

Bollocks!

So I'm not far now from getting the size I want - I hope!