I went to the LBS today, where they had Selle Italia, Fizik and some others.
The first saddle the produced was the Diva Flow Gel.. it didn't feel much different from the Liv saddle. Rather than measuring, they asked about where I get pain, so whilst testing the Diva Flow I pin pointed exactly which part of the saddle makes contact with the ouchiest bits. Based on this, I then tried a number of saddles with narrow noses (the more padded gel ones were all pretty wide). There was another Selle Italia ladies one, and a Fizik ladies one which were both really painful straight away but on a different way (I cycled to the shop so I guess any pain showed up more quickly than if I'd driven). The one I now have to demo is a men's one (another cheaper brand, can't remember the name). It has a narrow nose, large cut out and is slightly padded for the sit bones. I rode it home about 9.5 miles uphill. Far from painless but loads better.
It was certainly an interesting exercise, I'm glad I didn't just order the Diva Flow online and hope it was ok for me. I'm a bit worried that I don't like this one after a week's riding.. the guy in the shop said he would struggle to find another option for me.
My sister wants me to do a 40 mile ride with her on Good Friday (my longest so far being 20), so I could really do with being more comfortable by then!
On a slightly different note, ladies, do you think you're more sensitive down there at 'that' time of the month?
Thank you again for the great advice. Boon 51, my bike is definitely a ladies' model (pretty colours and everything), I need an xs ladies frame so didn't have much choice.