should I do a PPE degree ?Watch
You shouldn't be disadvantaged doing either though.
There are some specific roles that require an economics background, but these are generally in NGOs or the civil service - typically the latter will require for the specified economics stream positions that the degree needs to have at least 50% of its content as economics to qualify. I would note though that these are a relatively small number of roles in the civil service and most, as above, don't require any specific subject.
Per the previous response the key thing is whether you also want to study politics as well as the philosophy side of things; if not, probably better to just look for specific joint honours courses in economics and philosophy.