Katie Gleeson looks at what to expect over the next fortnight.

Tensions between Westminster and Holyrood came to a head this week as the Scottish Parliament voted to reject Westminster's EU (Withdrawal) Bill.  Labour, Liberal Democrat and Green MSPs joined forces with the Scottish National Party to refuse consent to the bill – which would, post-Brexit, see power over a number of policy areas currently held by Brussels (such as fisheries and agriculture) revert automatically to Westminster rather than Holyrood.

Westminster retains the power to overrule the vote, though this would overturn 20 years of constitutional convention. The Scottish Government has urged its the UK Government to respect the will of the devolved Parliament and to find a suitable solution to the issue, leaving the UK's negotiators with yet another complication to consider in the coming weeks and months.

Elsewhere, the by-election in Labour safe seat of Lewisham East, triggered by Heidi Alexander's move to become London's Deputy Mayor for Transport, has been set for Thursday 14 June. Labour's shortlist is formed of four Black, Asian and Minority Ethnic women – Janet Daby, Brenda Dacres, Sakina Sheikh and Claudia Webbe, with rival Labour groups Momentum and Unite expected to back different candidates – Sheikh and Webbe respectively. Meanwhile, Lewisham East's centrist-led constituency party is expected to support Daby and Dacres, leading a Momentum source to surmise that the election could be a "tough battle" for the left. In a time of disunity for a fractured Labour party, its final selection hustings will provide an interesting insight into the current balance of power between the party's factions.