British Pound bounces off one-week low vs USD amid Iran diplomacy hopes, ahead of UK CPI

• GBP/USD attracts some buyers during the Asian session, though it lacks follow-through.
• Hopes for US-Iran diplomacy undermine the safe-haven USD and support spot prices.
• Traders now look forward to the UK CPI report for fresh impetus amid fiscal concerns.

The GBP/USD pair edges higher during the Asian session on Wednesday, snapping a four-day losing streak to the 1.3360 area, or a one-week low, touched the previous day. Spot prices, however, lack follow-through buying and trade below the 1.3400 mark, warranting caution before confirming that the recent pullback from an over two-month high has run its course.

The US Dollar (USD) pauses following a four-day rally to a one-week high amid hopes that US-Iran diplomacy could ease energy prices and temper hawkish US Federal Reserve (Fed) expectations. This, in turn, is seen as a key factor lending support to the GBP/USD pair. However, the geopolitical risk remains in play amid a further escalation of tensions between the US and Iran.

Furthermore, traders are still pricing in the possibility of at least one interest rate hike by the US central bank amid concerns over energy-driven inflation. Against the backdrop of the closure of the Strait of Hormuz, Yemen's Iran-aligned Houthis declared a naval blockade against Saudi Arabia. This, in turn, pushed crude oil prices to a fresh high since June 12, fueling inflation fears.

Traders also seem reluctant to place aggressive bullish bets on the British Pound (GBP) and opt to wait for the release of the latest UK consumer inflation figures for more cues about the Bank of England's (BoE) near-term policy path. This contributes to keeping a lid on the GBP/USD pair as investors keenly await the new UK Prime Minister Andy Burnham's fiscal arithmetic.

UK debt market sensitivities in focus as Burnham leans on fiscal rule ‘flexibility’

Rabobank’s strategists flag that a key source of market unease is the lack of clarity around Prime Minister Burnham’s fiscal roadmap. They note that “it is still uncertain as to how Burnham plans to fund his agenda,” with investors now waiting for the 10-year plan he is due to unveil later this year. Rabobank highlights that Burnham has already signalled he will use “‘flexibility’ within the fiscal rules,” a formulation that is likely to keep market scrutiny elevated.

Against this backdrop, Rabobank points to structural vulnerabilities in the UK’s macro profile. “The UK has a low savings ratio and a large current account deficit,” they write, warning that “these metrics can increase the sensitivities of its debt market to perceived bad news.” While acknowledging that “the UK may not have the largest debt/GDP ratio in the developed world,” Rabobank argues that “arguably it has one of the most sensitive debt markets,” leaving gilts particularly exposed to any further doubts over the fiscal trajectory.