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I don't have any reviews of the P6 to hand, but I've emailed a couple of people at the company who may have access to a review or two of the P6. Hopefully tomorrow they may be able to dig something out for me and I'll post you a link or something to it on here.
The P6's are about 10/12 years old now, and I wouldn't say they were the strongest speaker in the P range. You'll probably find the Tannoys a more balanced and refined sounding speaker, but if you like your music on the warm side with a generous, if a little overdone, lower end, then the P6's might be for you - just make sure spares can still be had.