Welcome to the Forum Daz
Al is correctly quoting you for the EGC 'auto' version, but if yours is the 115 manual model, the stop/start cuts the engine as soon as the vehicle is in neutral and at speeds below12mph. The switching is automatic and from the clutch pedal when its fully depressed, so as soon as its next again depressed to engage gear, the engine is then automatically started without delay and the clutch will just seamlessly work as normal when you lift it to drive off.
It takes only a little while to get used to, but should you have a background noise - eg air-con running - its really only by looking at the rev-counter that you'll know for certain that the engine has been stopped. As with the ECG version the stop/start eco mode can be disabled with an override button switch on the lower dash right hand side.
No problems normally found at roundabouts etc. with this stop/start when driving the manual version thankfully - though if you are not familiar with a six speed gearbox, then choosing the best gear for ultimate smooth progress from roundabouts, road junctions etc. will give you something to adapt to......
Great vehicle to drive, and hope you'll enjoy yours soon.
Also agree with Al.. you have a car colour that will look special polished....