I am sorry I had to ask for a list but I could not identify the pieces under the first layer in your image.
The mark you sent an image of was used by Harrison Bros and Howson of Sheffield, UK. Your plated silver set dates ca 1940s. As you may know, the G R represents the monarch George VI Regent.
The A1 and Alpha represent the high quality plating of the set.
Your cased set as marked and described by you has a retail vintage store value of $800-900 assuming good condition.
A private seller to a dealer can expect 30-60% of retail value.
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