lovely little treasures from your family -
here's the very best site for British pottery -
www.thepotteries.or git's a HUGE site - so go to home page and start your searches 1 by 1. The Royal Cauldon piece is not as old as 1652 - but you may very well be able to establish age from backstamp -
Values aren't given on the site, but establishing the date is a start -
Based on previous web searches, your value for all of the pieces may be less than $200, but to identify them, age, and the history of your Gran, makes these priceless treasures to pass on. The Royal Cauldon dishes may prove to be the very best of the lot.
Quick rule of thumb - if it says England, it's after 1891. Made in England I would say 1920's or later.
If you need further assistance, post back, especially with pics - I love the old British and European ceramics. KB