Why does it take up to ten minutes for the charging to start?

This delay, also known as "randomised delay mode," is in place by UK legislation to make sure we don't put too much load on the electricity grid in the event of electricity reconnection following a power cut. 

Under this regulation, the start or stop of a charge point will be subjected to a random delay of up to 600 seconds (10 minutes). You may experience that the charging session will not start at the exact scheduled time and should take this into account when checking the charging status.

You can override this delay in the Monta app by tapping on “Switch to Charge now” right after the swipe to charge on each charging instance.