My experience of St Thomas' was five years ago but I still have very vivid memories.
During pregnancy, they were very good. I spent quite a lot of time in the day unit, and was admitted for a few days on two occasions. I was having my BP measured by my GP every 2-3 days and every time he'd say it was a bit high and I should go to the maternity unit. For those unannounced visits, I'd often have to wait a long time. For pre-booked appointments, they were very good and rarely ran late.
I had hoped to use home-from-home but wasn't allowed. My husband was keen on being at St T's because he liked the views!!
I was admitted for induction as I had pre-eclampsia. That wasn't much fun, I was forgotten about and ignored all night. However, when push came to shove, so to speak, the staff were excellent.
Post-natal was another matter. I was in for a week as I had a DVT. The midwives and other staff were mostly dreadful.
The food was rubbish, but they did a good pudding