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While I cannot speak to the high asking prices, in circulated condition these coins sell individually for 25p or so and a 15-coin set would bring 5 to 10 pounds, see: https://www.allcoinvalues.com/united-kingdom/1953-uk-sixpence-value2c-elizabeth-ii.html and see also In the UK, I'd recommend reaching out to the Royal Numismatic Society, see: https://numismatics.org.uk/ or alternately https://coincraft.com/ a major dealer in the UK. For references, this is a great place to start: https://www.coinsanduk.com/coins-prices-value.php