I haven't got access to much in the way of early (2003-2006) stats as we were with different hosts then. Currently, in December 2014 if you look at just the visitors from UK and TR only, 22.2% are based in Turkey and the rest UK.
Is that going on IP addresses though, Scunner?
I always use a VPN that shows me as being in the UK - if others do too, that would skew the figures.
(Still interesting though!) :-)