Why does Google think I'm in Japan?

[#1]

Weird one.
For the past day whenever I go to Google it loads with google.co.jp.
This is not just for 1 device. All devices in the house are doing the same thing - phones, tablets, laptop all on WiFi and a PC via PLA.
There have been no recent changes.
I never mess with the router (if it ain't broke, don't fix it etc).
If effecting all devices I'm naturally looking at the router being the culprit.
Have tried a full factory reset of the router and no change.
Any ideas where to look with this?
Thanks

[#2]

Hi Gravlock,
What router are you using at the moment?
One we've provided? If so, which one?

[#3]

01.14 am. Don't you guys ever sleep
There should be a like button for Plusnet staff 

[#4]

Pretty sure I'm some kind of robot

[#5]

this may help http://community.plus.net/forum/index.php/topic,139132.msg1226482.html#msg1226482

[#6]

Hi
Its a Technicolor 582n.
Checked all devices this morning and they're all back to normal, loading the standard localised Google.
Again nothing has changed and there's no one IT savvy enough in the house to mess with any settings.
Guess I'll never get to the bottom of it 
Thanks all

[#7]

That sort of thing is usually caused by IP address location errors. Perhaps Plusnet have a new range of IPs that need their location information updating, and if you have restarted your connection since having the problem and you don't have a static IP address, you'll have a new one with the correct details.
If you go to https://www.whatismyip.com/ it will tell you your IP address and location, and then if you click on "MY IP INFORMATION" it will tell you where it thinks you are in more detail. Note that it isn't geographically accurate - I'm in the North of Scotland and it thinks I'm in Tewkesbury...

[#8]

Gravlock is in Leeds or London according to my checks.

[#9]

it thinks I am in Pudsey

[#10]

We've not introduced any new IP's recently, although we probably will be doing next week.