I remember enjoying Slade in Flame by John Pidgeon. It came out after the surprisingly good film but it isn't a straight novelization, being different in a lot of ways and much, much grittier. Very well-written too by a guy who was a cryptic crossword setter for the Daily Telegraph.
The film's on youtube if anyone's interested. Better than the other cash-in 1970s Brit films with musicians in. Noddy Holder's great in it.
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