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It is not a Keith solo tune. The song is on Ian McLagan's Little Troublemaker album. I've been looking for it for a long time, but can't find it anywhere.
Ian released the album on cd with the Last Chance For A Dance ep, as well as some bonus tracks, including the unedited version of Truly. You should get it from Mac´s pages, it´s for a real alright price. I just got it in the mail today. in the cover, Ian writes that Truly was recorded by the New Barbarians at the end of the US tour in 1979.
If you don't have it, order the cd from Ian McLagan website. Ian is a really nice guy, he signs your CD. I think the revenues go to him. You don't sponsor big record companies that sue civilians if you buy his CD. Anybody who is thinking of posting the tune. Please don't do it. This is one thing people should buy.