Turning off IPv6 on a Sky ER110 ?

I want to turn off IPv6 on my Sky router (ER110).
On the LAN TCP/IP Setup page, there seem to be 2 places to do this...
1) There is an option for 'Enable IPv6 on LAN side' - which is ticked
2) There is also an option for 'Enable IPv6 DHCP Server' - which is ticked

Do I just un-tick these 2 and reboot everything?

Is there anything else that needs changing?

Any suggestions/feedback appreciated