Hi, I've applied to do a Law degree at Durham (fingers crossed for the grades on the 18th lmao) and I did Philo and Ethics at AS/A2. It was my favourite subject - I found it incredibly enriching, interesting, and it got me properly into philosophy which I now read in my spare time. The essay writing is a hugely valuable skill, which will come in handy in a law degree - your teacher should hopefully show you how to form a proper argument and evaluate the issues in much detail.