New British Secret Projects volumes from Tony Buttler

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I know many of you on this forum read or heard of Tony Buttler's British Secret Projects: Fighters and Bombers 1935-1950 (Midland Publishing, 2004), but that book has since been split by Buttler into two separate volumes (available from Crecy Publishing) based on newly unearthed project documents and British Air Ministry documents:

British Secret Projects 3: Fighters 1935-1950 (see Amazon product ASIN 1910809179)
British Secret Projects 4: Bombers 1935-1950