British Pound sticks to post-UK inflation losses as faster BoJ rate hike bets lift JPY

• GBP/JPY drifts lower as mixed UK inflation figures temper BoE rate hike bets and weigh on the GBP.
• Reports of a faster BoJ policy tightening and intervention risks lift the JPY, further exerting pressure.
• The wide UK-Japan rate differential warrants caution before positioning for any meaningful decline.

The GBP/JPY cross attracts some intraday sellers on Wednesday and slides below the 218.00 mark during the first half of the European session. Spot prices remain, however, confined within the previous day's broader range amid the supportive fundamental backdrop.

The British Pound (GBP) weakens slightly following the release of mixed UK inflation figures. The Japanese Yen (JPY), on the other hand, gets a minor lift in the wake of a Bloomberg report that Bank of Japan (BoJ) officials are open to raising interest rates at a faster pace. Apart from this, speculations that Japanese authorities will step in to prop up the domestic currency prompt JPY short-covering and exert some intraday downward pressure on the GBP/JPY cross.

The UK Office for National Statistics (ONS) reported that the headline Consumer Price Index (CPI) rose 2.6% over the year in June, missing expectations of a slight deceleration to 2.7% from 2.8% in the previous month. Additional details revealed that the core CPI (excluding volatile food and energy items) climbed 2.6% YoY, compared to the forecast of 2.5%. Nevertheless, the data tempered hopes of a Bank of England (BoE) rate hike and weighed on the GBP.

Analysts at ING note that, “despite the slightly higher-than-expected UK June core inflation data this morning,” their UK economist James Smith “thinks the underlying trend is heading in the right direction.” Smith points to easing pressures from food and petrol, alongside softer core services inflation, as evidence that domestically generated price pressures are becoming more benign. ING adds that Sterling has slipped in response to the data.”

The immediate market reaction, however, remains limited as trades seem to have fully priced in a 0.25% BoE rate increase by September. Moreover, a second hike is expected before the end of 2026, which would bring the official rate to 4.25%. In contrast, the BoJ's short-term policy rate is 1.0%. This leaves a wide interest rate differential, which continues to fuel the so-called JPY carry trade and acts as a tailwind for the GBP/JPY cross, warranting caution for bears.

Meanwhile, investors remain worried about economic risks stemming from  the US-Iran standoff over the Strait of Hormuz as Japan relies on the critical waterway for over 90% of its oil imports. This, in turn, suggests that the path of least resistance for the JPY remains to the downside, making it prudent to wait for strong follow-through selling before positioning for an extension of the GBP/JPY pair's pullback from its highest level since January 2008, touched last week.