When did the smoking ban came into the uk?
Smoking in workplaces and enclosed public spaces has been illegal since 26 March 2006 in Scotland, 2 April 2007 in Wales, 30 April 2007 in Northern Ireland and 1 July 2007 in England. 
When did the workplace and enclosed public space smoking ban come into effect in Scotland?
26 March 2006
Smoking in the United Kingdom
Smoking in workplaces and enclosed public spaces has been illegal since 26 March 2006 in Scotland, 2 April 2007 in Wales, 30 April 2007 in Northern Ireland and 1 July 2007 in England. 
When did the workplace and enclosed public space smoking ban come into effect in Wales?
2 April 2007
Smoking in the United Kingdom
Smoking in workplaces and enclosed public spaces has been illegal since 26 March 2006 in Scotland, 2 April 2007 in Wales, 30 April 2007 in Northern Ireland and 1 July 2007 in England. 
When did the workplace and enclosed public space smoking ban come into effect in Northern Ireland?
30 April 2007
Smoking in the United Kingdom
Smoking in workplaces and enclosed public spaces has been illegal since 26 March 2006 in Scotland, 2 April 2007 in Wales, 30 April 2007 in Northern Ireland and 1 July 2007 in England. 
When did the workplace and enclosed public space smoking ban come into effect in England?
1 July 2007
Smoking in the United Kingdom
No context provided
When did the smoking in the car with children ban come into effect in the uk?
1 October 2015
Smoking in the United Kingdom
https://en.wikipedia.org/wiki/Smoking%20in%20the%20United%20Kingdom
Smoking ban in England
https://en.wikipedia.org/wiki/Smoking%20ban%20in%20England
A smoking ban in England, making it illegal to smoke in all enclosed work places in England, came into force on 1 July 2007 as a consequence of the Health Act 2006. Similar bans had already been introduced by the rest of the United Kingdom: in Scotland on 26 March 2006, Wales on 2 April 2007 and Northern Ireland on 30 April 2007.
Smoking ban in England
On 1 October 2015, a law was passed which banned smoking in vehicles with anyone under eighteen years of age present. The law does not apply to e-cigarettes, if the driver is seventeen years of age and alone in the vehicle, or in a convertible with the roof completely down.
Smoking in the United Kingdom
A smoking ban in England, making it illegal to smoke in all enclosed public space and workplaces, came into force on 1 July 2007 as a consequence of the Health Act 2006. Similar bans had already been introduced by the rest of the United Kingdom: in Scotland on 26 March 2006, Wales on 2 April 2007 and Northern Ireland on 30 April 2007. On 1 October 2015, a law was passed which banned smoking in vehicles with anyone under eighteen years of age present. The law does not apply to e-cigarettes, if the driver is seventeen years of age and alone in the vehicle, or in a convertible with the roof completely down.