Do women's specific bikes have frames with altered geometry? Always thought it was just marketing bollox;
It is marketing bollox. The SO's myka in size WM (womane M) as exaclty the same TT length than my Meta in size MM (Men M).
I would stay away from the zesty and lapierre for two reason.
First they are very long. Like in very long. Second they don't work as well as the other bike when pointing down.
In no particular order I would look at :
Commencal meta 5. This year meta 55 retail at a bit less than 2000€ so 1659£ a little bit more than what you've expected but worth every peenie in my opinion (I have some SO's and meta love stories is you want to).
Kona tanuki amazing value for money, and a broad range of sizes.
The obvious orange 5, but it might come out of your budget.
Scott genius, you should talk to blumey on here for more info on it.
But then I would suggest to try and demoed a few before you make your choice.
HTH