Updated 13 Dec 2016
The rules are available online, but it should be noted that the changes made in July 2014 are not yet included there. These changes are contained in The Church Representation Rules (Amendment) Resolution 2014 (SI 2014 No. 2113).
So far as I am aware these are the only changes since 2011. See second comment below for other changes.
Nearly all the changes made in 2014 related to elections to General Synod. There were also some amendments to the forms in Appendix I to make it explicit in each case that only lay persons are entitled to be entered on the church electoral roll.