http://imgur.com/a/FwD3n The front side of the plate and the only mark I`ve seen on them.
Backstory: Grandma had them from her mother she passed away and i just got them.
Thanks I'll look for more info now
The maker's mark indicates a date between 1936 and 1954. It appears to be from North Staffordshire, England. A Google search of "Grindley England thirlmere" yields examples on Ebay. Hope that helps.