1. Right outside your house? - Yes
2. In heavily packed commercial places? - Yes, London is a perfect example.
3. Restaurants/Lounges/Coffee Shops? - No, because smoking inside public places is banned.
4. Parks? - Yes
5. On the road/in Your car? - Yes
6. Near the parliament? - Yes
7. Next to a police station - In some cases, YES [some of them are always closed or unmanned]


As long as your an adult, in England your chances of being done for smoking are extremely low, and as for actually being arrested - almost nill, unless other factors are taken into concideration.