The checkyourchange.co.uk website is run by the proprietor of Rotographic Publications, Christopher Henry Perkins.
The postal address (note that this is a residential address and is not usually suitable for visitors) is:
53A Tremaine Road
London, SE20 7UA.
I don’t answer “What’s it worth?” questions as I get too many and most are answered in my book or the Check Your Change app! For any kind of coin enquiries, in the first instance please try the Facebook group:
Telephone (after you’ve thoroughly checked the website and if possible the Facebook group, as I do sometimes get enquires that are already answered on these pages):
020 308 69996