Smiths Enfield Mantle Clock?

I have just purchased an Smiths Enfield Mantal Striking Clock, had it cleaned and overhauled, now has a 1 year guarantee with it, BUT how do I get it to go, I have put the weight back on, the clock is wound up, but I think there is a switch that I need to move in the back for the clock to start ticking????
Tick Tock, October 2018


done
lightly swing the pendulum

Tom Watson, December 2018