Depends how far you're going out of Leicester as well to be honest....I would highly advise going that little bit further and staying in Rutland - England's smallest county. Rutland Water at the heart of it is the perfect place to spend a day or two with walking, sailing etc.
Also, if you're in Leicester and need any van bits or just a good browse to update equipment at the start of the season go to the Caravan Company just down the road from the new Highcross...I came across their details on www.touring-caravans.com and was very impressed and ended up virtually buying the shop!!