There are several companies - *****, *****al Swansea, Grimley - who make patterns similar to yours. They all feature the textured border and the roses in the center and on the verge.
I agree that your plates are from the mid-19th century. The lack of a maker's mark will be detrimental to their value.
If they are in perfect condition, their current retail (replacement or insurance) value is approximately GBP150 for the pair.If you were to sell them, you could expect to get the fir market (private sale or auction) value of approximately 40% of the retail amount, or GBP60, depending on location and actual condition.
I hope this helps you, Sue, and that it brings you closer to retirement.
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