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One CRM121A box was marked with £18.3s.2d. Would that have been the price...?
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Seems probable. The nearest comparable reference to hand here is Ferranti's 1956 guide to valve and tube replacement, where 12" tubes are priced, inclusive of purchase tax, at £17.5s.4d or £18.6s.11d according to type. (Pre-tax prices were £12 and £12.15s. respectively).
Paul