Can you help find this UFO book from my 70/80s childhood?

The first UFO book I remember owning was an A5 sized paperback, just over an inch or so thick and the front cover was silver.

I remember it because it had photos of Charles Hickson and Calvin Parker. Now I have just seen archive and more recent footage of these two gentlemen on a new and enjoyable Netflix documentary episode, I really want to track this book down.

Anyone think of a distinctive silver UFO book probably published in late 70’s or 80’s?

TIA.