Burnham to become UK prime minister as unions demand wealth tax

Andy Burnham will be unveiled as Sir Keir Starmer’s successor as Labour leader on Friday, entering Downing Street three days later. His path to the premiership was sealed when 349 of the party’s MPs nominated him, making it mathematically impossible for any rival to stand.

To formally clear the final hurdle, party rules required him to secure endorsements from at least three of the 31 affiliated socialist societies and trade unions, including a minimum of two unions. Eight of the 11 affiliated unions met this requirement ahead of the official 24-hour nomination window opening this evening. TSSA, ASLEF, Community, GMB, Unison, the Fire Brigades Union, Unite and shopworkers’ union Usdaw all confirmed their backing.

This union support guarantees Burnham will be crowned without a full party vote over the summer. For European investors and businesses, the seamless transition removes a layer of political uncertainty in the UK. However, the conditions attached to that backing signal the fiscal pressures that will define the new government's early agenda.

Unions play a foundational role in financing Labour operations. In the first three months of this year alone, seven different unions contributed £1.4m to the party, accounting for approximately a third of its total donations during that period. Labour's most recent annual accounts show it also gained £4.9m in affiliation fees in 2024.

Unite has made it clear that this financial and political backing comes with strict economic strings attached. The union stated its future support for the Burnham premiership will be conditional upon delivering action for "workers and communities". For markets, the most pressing demand is the introduction of a "wealth tax" designed to increase day-to-day public spending.

Unite is also pushing for the government to unfreeze tax band thresholds and loosen borrowing rules to facilitate greater investment in jobs and growth. These demands will inevitably factor into upcoming fiscal statements and dictate the regulatory environment for businesses operating in Britain. The union's stance on the energy transition adds another layer of complexity for the broader European economy.

Unite issued a direct warning that the shift towards net zero carbon emissions must avoid "industrial vandalism". By explicitly referencing job losses in the oil sector, the union is signaling potential resistance to rapid green transitions that do not protect traditional energy workers. This position will influence how the new prime minister balances climate commitments with industrial policy.