Speaker John Bercow grants a Labour request for an emergency debate on the government's response to last week's vote on universal credit.
The European Parliament debates new rules for fertilisers, a new regime for monitoring "legal highs" and protection of whistle-blowers.
Committee members hold a scrutiny session with the education secretary. In plenary AMs debate transport technology, travel entitlements for 16 to 24 year olds, and the north Wales economy.
Finance Secretary Derek Mackay says air passenger duty is not in a fit state to be passed to Holyrood.
With the non-appearance of the EU Withdrawal Bill, focus turns to the ways parties can make waves over Opposition Day debates.