Big Shoes
After extensive research I have managed to get a Japanese website that has Large (well normal to us)size shoes for men and women.
Here is a breakdown of what I have found.
http://www.tyomora.co.jp/ Sizes 22 ~ 30 but some 31, 32 , 33 Japanese and Engrish. I have had a good look at this site although it is not the best looking. There is a very big selection. Even has a good refund policy.
http://moonstar21.com/ Sizes 23 ~ 28 Japanese only Men and Womens
http://www.modelsize.com/ 22 ~ 30 Japanese Only Womens (it may have mens but I just cant navigate)
http://shoes-ten.com/ 22 ~ 28.5 Japanese Only Mens and Womens
http://www.rakuten.co.jp/tyomora/ 22 ~ 28 Japanese Only Seems to be the sister site to tyomora.
http://www.maggie.co.jp/ 22 ~ 28 Mens Japanese only.
I have also looked at a load of conversion charts. I dont feel hugely confident in any of them.
MENS
UK 10 US 10.5 EURO 44 J 29
UK 11 US 11.5 EURO 45 J 30
UK 12 US 12.5 EURO 46 J 31
WOMENS
UK 7 US 9 EURO 40 J 26
UK 8 US 10 EURO 41 J 27
UK 9 US 11 EURO 42 J 28
If anybody has had any actual experience with these sizes please tell. As I am very doubtfull they are exact I take a uk Size 12 and used a measuring tape and I was 30cm it may Just be the Designers.
Some runners (in ireland we call trainers runners, aint that silly) like VANS usualy I find that a smaller size is ok if you are in need of shoes.