I think you re been ripped off ! !, no there is no gasket and a sump is only around 60 - 80 UK POUNDS (non genuine part) and then the sealent for the best results is around £20 a tube (
http://www.ebay.co.uk/itm/like/32078...f14=108&ff19=0) and not a hard job to do, the other work again wow very expensive ! maybe ring around other workshops for prices !