Former Prime Minister Boris Johnson wished incoming Prime Minister Andy Burnham well while warning the new government to control public spending [1].

This transition occurs as the new administration faces an immediate and costly confrontation with private creditors over the future of the UK's water infrastructure. The clash highlights the tension between the government's social utility goals and the legal protections afforded to private investors.

Johnson spoke from Downing Street regarding the handover of power [1]. He said the incoming government has limited time to establish its priorities and must get a grip on spending to ensure economic stability [1].

While the political transition unfolds, a group of Thames Water lenders is preparing a legal challenge against the government [2]. The lenders are plotting a multibillion-pound [2] fight to block Burnham's plan to forcibly nationalise the water company [2].

Burnham said the utility should return to public ownership to address systemic failures. However, the lenders argue that a forced takeover without adequate compensation would violate their contractual rights and legal protections [2].

This legal battle is expected to be one of the first major tests for the Burnham administration. The outcome will determine whether the government can unilaterally seize private assets in the interest of public service without triggering massive payouts to international creditors [2].

Johnson's warning about spending coincides with this looming legal threat. If the government loses the challenge or is forced to pay out the full value of the lenders' claims, the cost of nationalisation could increase significantly [1], [2].

Boris Johnson warned the new government to control public spending.

The conflict over Thames Water represents a pivotal moment for UK infrastructure policy. If the Burnham government successfully nationalises the utility despite lender opposition, it may set a precedent for the state to reclaim other failing private services. Conversely, a legal victory for the lenders could severely limit the government's ability to intervene in privatised sectors without incurring prohibitive costs, effectively constraining the new administration's fiscal and policy ambitions.