An update as promised.
Vaping for 8 days now, just got an eGo C VV. Wow!
The sore mouth thing was a one-off, definately the body acquiring a tolerance to PG or/and VG.
I don't know why starter kits seem to be supplied with a PG rich mix, as it's not great for new vapers. Much happier with a 50:50 mix.
Anyway, the message to newbies is not to be put off in the first couple of days with any bad reactions. It IS temporary!
Feeling so much healthier having given up the cigars.