IMO Phev's are useful if you dont have a driveway or cant charge from home.
I see them as the opposite really, they almost only make sense (outside of tax dodging) if you can charge at home.
You can do all your local driving on electric, possibly even a decent commute with some of the longer range ones, get all the convenience of cheap home charging but no range anxiety if you have odd habits or routines that might be a pain with an EV alone. That way you can look past the fact you're lugging an engine and battery around, because you can do enough mileage on cheap electric.
Throw in half decent BIK rates still, fuel cost based mileage reimbursement and doing around 1500 miles between fuel fills and they can make a lot of sense in the company car market.
I haven't charged mine on a public charger once yet because it's (usually) more expensive than just running the engine in that case. This is why people who only get them because of company car tax often don't ever charge them if they can't home charge.
