UK borrowing costs rise and pound falls as leadership drama continues

UK government borrowing costs surged to an 18-year high and the pound fell against the dollar on Friday, as markets reacted to Andy Burnham's entry into the political fray ^[1][2].

The yield on the benchmark 10-year UK government bond, which moves inversely to its price, rose to approximately 5.14% ^[1][2], a level not seen since 2006. Sterling fell 0.3% to $1.3371 ^[1][2]. The market moves followed the announcement by Andy Burnham, the mayor of Greater Manchester, that he would run for a parliamentary seat in the upcoming Makerfield by-election, seen as a step toward contesting the Labour leadership ^[1][2]. Analysts warned that Burnham's candidacy could prolong political uncertainty and negatively impact UK gilts and the pound ^[1][2]. Kathleen Brooks, research director at XTB, said the falls meant the pound was 1.5% lower for the week and noted Burnham was perceived as the 'least market-friendly' of the potential candidates ^[1]. AJ Bell investment director Russ Mould said a comment Burnham made last year about being 'in hock to the bond markets' had 'helped push UK borrowing costs higher and seen the pound slump' ^[1]. He added that a process involving Burnham 'promises to be more protracted and 'noisy', thereby prolonging and exacerbating the uncertainty' ^[1]. Jefferies economist Mohit Kumar told Reuters the market's fear was that 'Burnham would be more left leaning, and we could see further increase in deficits' ^[1]. The FTSE 100 index fell 0.6% amid the broader market unease ^[1].