What’s the best hair dye for natural light brunette?

I have natural light brown hair and it is starting to turn grey. I’m looking for any suggestions for a good natural hair dye that will cover the greys. I’m sad about having to die my hair as it goes a bit auburn in the sun as you can see in the picture, I had blonde hair growing up and it naturally darkened. I’m in the Uk so what’s the best brand or actual link to a hair dye that is suitable for me and will match my natural colour the best, I really don’t want it any darker if that’s possible (but I’m clueless) thank you :)