I think that’s the key thing Glos Guy, as Oscarmax says, the maximum claimed range of most PHEVs is around 30 miles, and in many circumstances will be much lower.
For example, when you fully charge an XC40 PHEV, the range readout says 28 miles, but immediately after setting off it drops to 18 to 24 miles.
I learned this from the XC40 forum be where numerous owners have reported the same thing.
Have also read reviews of other PHEVs doing the same.
Only you can decide whether a PHEV is suitable for your 30 mile round trips, but it sounds to me as though the engine would be kicking in regularly.