I was interested to read the letter about TomTom satnavs (Bachelor and Brignall, 5 May). Two weeks ago I purchased a new TomTom from John Lewis in Rushden. It didn't work so I took it back and they gave me another. That one didn't work either. When I opened a third I noticed a small round label – about 2cm across – mostly obscured by a sticky stock control label. It said that I had to download a fix to make it work.

After several hours of trying, I went to Halfords in Northampton and they were able to point me in the right direction. They thought that it was something to do with the leap year. I eventually downloaded the fix.

I went back to John Lewis and told them what the problem was, and that it would be a good idea to tell customers. The people I spoke to were unaware of the problem. MF, Northants

Other readers (and retailers) take note if you're buying a TomTom. It is, as you say, a reported leap year problem on certain models, but why retailers appear to be unaware of this is a mystery.

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