They are only available in two sizes for 17s. 205/40 and 205/45. The General Altimax RT 45 (available in many sizes) are a smooth and more quite tire and cheaper—-that’s what I run here in the US. But someone said they are not available in the U. k.
Of course the p5s are ultra max performance summer tires and the RT 45s are touring tires. Almost any touring tire is going to have a better ride and less noise than max. performance tire. ———-I was running the Continental Extreme Contact 06 plus which are a ultra high performance all season tire, they had a good rating for being a smooth/quiet riding tire, but for me not so much. My Generals handle comparable to those but wth a much more smooth and quiet ride. —-I’m sure the sport 5s would be a good choice for one of the best handling street tires having a decent ride, Mitchelins are hard to beat.
Some of the roads here in California are heavily chip sealed (not sure what that’s called in U.K.) and it makes for a noisy ride no matter what tire you have, Oregon also.