Half way through the day tommorows crackerjack day yippie, been quite a productive day james uren has helped me find a chip I have spent a few hours going through websites such a RS canford and farnell found a few chips however james recomended a certain chip for my project that is from RS
http://uk.rs-online.com/web/search/searchBrowseAction.html?method=searchProducts&searchTerm=LMD18200T&x=0&y=0

this chip does everything I want it to do and takes a load off my mind because I dont have to build a circuit to do it plus this is a benifit because it makes servicing it alot easyier in future you just replace a chip as gorden ramsey says "Done".