I'm not sure they do (my other half's "mild" hybrid certainly has manual transmission). As a general point though if you're using an internal combustion engine to directly (mechanically) drive the wheels you'll need some kind of gearbox (and clutch) as IC engines are rubbish at anything other than a relatively narrow band of revs. Wheels driven by electric motors though usually don't need to change gear as the motors can be sensibly driven at a very wide range of revs. I'm not sure if there's anything to dictate the choice of gearbox - continuously variable, automatic or manual  though.

   - Andy.

I'm not sure they do (my other half's "mild" hybrid certainly has manual transmission). As a general point though if you're using an internal combustion engine to directly (mechanically) drive the wheels you'll need some kind of gearbox (and clutch) as IC engines are rubbish at anything other than a relatively narrow band of revs. Wheels driven by electric motors though usually don't need to change gear as the motors can be sensibly driven at a very wide range of revs. I'm not sure if there's anything to dictate the choice of gearbox - continuously variable, automatic or manual  though.

   - Andy.

Yes, but a hybrid IC engine that just charges a battery at optimum revs and then cuts out until battery drops to 75% has the best of both worlds. No gear box needed and can be charged at home if cheaper.

However, the ICE needs to be switchable off in city centres or it will have to pay congestion charges and other clean air taxes.