30-12-2018, 02:53 AM
Thanks to Ritchie for mentioning this (new to me) Japanese tool brand - a quick search shows that Ko-ken (UK) Ltd are based in Bolton. The availability of imperial sized stud extractors is mentioned on their products page.
http://www.koken.co.uk/services.html
http://www.koken.co.uk/KOKEN_201708ENSP.pdf
http://www.koken.co.uk/contact.html
http://www.koken.co.uk/services.html
http://www.koken.co.uk/KOKEN_201708ENSP.pdf
http://www.koken.co.uk/contact.html