I'd note you don't need to do a degree in law to become a solicitor in any event.
Note that time and again research has shown that long term employment outcomes for STEM and non-STEM graduates are equivalent, statistically.
Your degree subject is effectively a non-factor when it comes to applying to generalist grad schemes that have no specific required degree course. I know it's very popular for 6th form students to circle jerk over "this degree subject is better than that" but the reality is employers don't give a toss. They see you have a degree a 2:1 or above, tick that box on the recruitment process, and move on to assessing the rest of your CV.
Just do whatever you have a genuine intellectual interest in, so at least then when you get a job staring at spreadsheets for 8 hours a day like everyone else (whether they studied English lit, economics, physics, theoretical quantum biology, or underwater basket weaving) you can have some good memories of life before the endless toil of employment.
PPE normally requires maths, which the OP doesn't have.