For ONE models, I recommend you try navcore 9.170 SE:
Navcores 9.061 & 9.170 for 32Mb ONE models [by mark cat]
You can use almost any map you want, as long as it fits in your device and most importantly as long as the meta is available for that particular map.
Have a look in the Map Thread Finder:
or for the previous v895 map versions, look here:
Map Thread Finder - Tomtom v895 Maps
Since you live in the UK, I would assume you're after a UK map for your friend's TomTom. Here is the latest full featured UK map you can use with the 9.170 navcore:
If you need more information on activating the map, go to the Tutorials section.