For mortgage professionals, the prospect of a Burnham premiership matters because it almost certainly means a government positioned further to the political left than the present one. His platform has included calls for stronger state control over housing and infrastructure, and financial market commentators have flagged that the ideological direction of travel is hostile to the concentration of wealth that tends to be stored in prime London postcodes.
“With the Labour Party likely to retreat into its political comfort zone, it’s difficult to see an outcome where the government doesn’t move to the left, irrespective of who is leader.”
— Tom Bill, Head of UK Residential Research, Knight Frank, 29 May 2026
Blair Enters the Ring and CGT Returns to the Agenda
The debate gained a new dimension this week when former Prime Minister Tony Blair published an essay on Labour’s governing priorities. Among his observations was a notable one: the previously dismissed idea of aligning income tax and capital gains tax rates should not be discarded out of hand. That single passage sent a shudder through wealth advisers and property lawyers — not because it represents current policy, but because it signals the intellectual space in which the next Labour leader may operate.
Wes Streeting, another potential leadership candidate, has already sketched out a vision that includes changes to capital gains tax rates. The pattern is consistent: every leadership contender is reaching for the same toolkit of asset taxation, which in the UK context inevitably means property. For brokers arranging mortgages on second homes, investment portfolios or higher-value primary residences, these are not abstract ideological disputes — they are the forces shaping client appetite and transaction volumes right now.
If any Chancellor finds it impractical to cut spending meaningfully or introduce broad-based income tax rises, the financial logic points, as Bill puts it, towards another “smorgasbord” of taxes on wealth and property. A government that drifts leftward — irrespective of whether Starmer or Burnham occupies Number Ten — is, for these purposes, a government in search of the same revenue sources.
The Stamp Duty Millstone
The tax environment is, of course, already hostile. SDLT thresholds reverted to pre-2022 levels in April 2025. According to analysis published by London Business News on 20 May 2026, a buyer acquiring an average £2 million prime property in central London now hands HMRC £153,750 in stamp duty before a single key turns. Add the additional-property surcharge or the non-resident surcharge and the bill climbs past £250,000. For a buyer financing that acquisition with a mortgage, the transactional friction is now so great that hesitation is not merely rational — it is the default position.
