Hi Hannah
I had both my children at the Whittington (Archway, N London). The staff were brilliant but the wards were old and a bit grubby really. However, they, like so many hospitals, have been doing a lto fo rebuilding and already their neo-natal dept is fabulous.
I;m sure some other mums will be able to give you feedback.
I have friends who had their kids at the Royal Free and were happy with the treatment. The main thing there is that it's a nightmare (and v expensive to park eiither near or in the hospital) and not that easy to get to unless you are v close by.
I will also ask around my other London mum friends for their opinion on the others for you!