Clutch change? Slave cylinder?

With my release bearing going and clutch replacement imminent I’m about to order a new clutch.

I’ve been looking on here and notice that a lot of people order the slave cylinder at the same time as a new clutch. It’s a well-known fact that my mechanical knowledge is appalling so I ask;

Should the slave cylinder be changed at the same time? Is there anything else that I should do while it’s all out?
Thanks
 
whilst its apart check the downpipe flexis as well

and change the gearbox oil don't put the old stuff back