Cornwallis,
The Instrument Plates for both the RNAV Initial Approaches and the RNP Final Approaches at Gatwick should be available in the AIP, as they were published as an AIP Supplement.
An RNAV approach is planned to Rwy 26R at Gatwick. There is however an issue with the runway being designated a Non Instrument runway and then publishing an Instrument Approach to it. Discussions are on-going between NATS and the CAA on this topic. Initial procedure designs have already been drafted, and a procedure will hopefully be introduced soon.