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! 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