The Parish Church of St. Peter and St. Paul is on the grounds of Belton House, although it is not actually maintained by the National Trust.
The church has a range of features that are Norman, Medieval, Georgian and Victorian and was surprisingly pretty inside.
It contains some beautiful stained glass windows; these which feature a coat of arms
and this window representing three miracles of the Raising of the Dead, including that of Lazarus.
It also contains forty monuments, most of which concern the Brownlow and Cust families who owned Belton House. My favourite was that of Sophia Hume, Countess Brownlow by Antonio Canova, and one of only two monuments by Canova in English churches.
The church may be small but it is definitely worth a visit if you are also visiting Belton House. You can find more of my photos here.