The agreement, with the Westminster Government, is being seen as an important step on the path to further devolution. Our political editor Adrian Masters has been looking at what difference the change could mean.
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A cold start to the day but turning wet and windy later, if a little milder! Be warned though, there's an ice warning for tonight!
A report commissioned by the National Assembly calls for at least 80 -and preferably closer to 90- AMs, rather than the present 60.
A man was rescued by a Coastguard rescue helicopter after being injured in a 80ft fall from a frozen Snowdon ridge.