BetBlocker is a free tool to help you control your gambling. Install it on as many devices as you like and you can block yourself from accessing over 4300 gambling websites. You can select how long you want to be blocked for.
Please remember that once the tool is activated you cannot remove the restrictions until your selected restriction length has expired.
BetBlocker also has a Parental Controls setting that allows you to switch the tool on and off via a password so that parents can stop their children accessing gambling services (and other sites!!)