To set the next year's state pension increase, the triple lock uses the inflation stats for the year to September and wage growth figures for between May and July.
Asked for his take on next year's triple lock trajectory, Mr Stimpson said: "With the Bank of England cutting the base rate to 4.5%, a sharp drop in permanent staff vacancies, and downgraded growth forecasts, the economic outlook remains uncertain.
The unpredictable economic climate makes it hard to know whether inflation or earnings growth will be the key metric for next year, experts say.
"While inflation has been a key concern, the latest data showing wage growth close to or outpacing inflation adds a new dimension to the triple lock calculation."
The triple lock safety net ensures state pensions go up each April by whichever is higher: average earnings growth, inflation, or a baseline of 2.5%.
