How to change google search timezone on iPhone?

I live in the UK but when I recently returned from a holiday in Japan, google search on my iPhone has set Japan as my timezone. So when I search for something time related (e.g. 'time in uk') the result presumes I'm in Japan. My search is.co.uk and my iPhone clock is correctly set to uk, it's just the timezone when I perform a search. My iphone settings appear to be correct.

You can't change it I guess so.