Total GPS sales in the UK?

[GeoBloke]

After witnessing in this past Xmas season what I think is the first real mainstream marketing campaigns for satnav devices, I'm curious about GPS sales and general public awareness of things GPS and personal navigation. Anyone know where I could find market information on total GPS sales in the UK for the past few years? I know Garmin, TomTom et al would be happy to tell me how many of their units they've sold but is there somewhere more...central?

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