Ann hi...within 100 miles of Sheffield...that is a very wide spectrum...I guess you don't mind in which direction...or whether it is country or coastal..Having said that a lot of the sites that stay open for New Year get booked up very early...that is the case with the C.Club sites.
Is it a Club site..c.l. or commercial you are looking for.
A few more details and someone may be able to help more.
Chrisanne.