Paul, no
a quarter page is a quarter page, doesn't matter how big the page is
Adam, each area's book has slightly different prices. Can you access this page?
http://rates.yelldirect.com/showRates.aspx?directory=5242&edition=74140&dt=1&action=3Not sure if you need to be logged in to the site to view it. here's a screen grab:
I would look at this year's book and judge for yourself what is going to stand out more - most companies run the same ad, or same sized ad, year after year. Basically the more there are, the more you have to stand out. Don't take any crap about colour being better. Monochrome (black on yellow) with LOADS of reverse copy stands out better than finely detailed colour artwork, in my opinion. Obviously you get more page space for your money with monochrome.
I think with yell.com again it's down to how many competitors are coming up on the search result for your area.. just had a look... 10 pages! Only a sponsored listing is going to guarantee being in the top three (order will rotate). Next one down will keep you near the top but anything after... who looks all the way to the end of page 2 then on to page, when browsing yell.com looking for a service? Not many....
I wouldn't bother with it, just try to get the biggest book ad for your money, maybe do yell.com next year.