PPL without IMC:
In Class G: 3km minimum
In CAS: 10 km minimum (assessed in flight if you're not landing or taking off at the associated aerodrome and the official met vis if you are!)
PPL with IMC:
In Class G: 1800m for t/o and landing below cloud
In CAS: 3km minimum
Again, this from memory after a poor night's sleep, so apologies for errors. By the way, there was a good article in 'Flyer' this month about the choice of SVFR or VFR in CAS. Worth a read.