As a low-cost alternative (but not free) there are several examples in the Which? Consumer Guide "Wills and Probate", which is quite a good book for DIY on straightforward wills. �10.99 when I bought it (2003).
You can view some pre 1858 wills on the Public Records Office Documents Online site. After 1858, you will need to request a copy from York Sub Probate Registry and it will cost a fiver.