ITA (matrix.itasoftware.com) gives the breakdown as:

ORK-LHR:
EI YQ surcharge (YQ) €6.85
EI YR surcharge (YR) €15.00
Irish Airport Security Charge (BC) €5.50
Irish Passenger Charge (UP) €14.38
Irish Air Travel Tax (LQ) €3.00

LHR-ORK is given in EUR as:
EI YQ surcharge (YQ) €20.35
EI YR surcharge (YR) €14.41
United Kingdom Air Passengers Duty (GB) €14.41
United Kingdom Passenger Service Charge (UB) €27.75

- obviously some of these are GBP figures in reality getting a live FX that may differ from that being used in your figures.


EDITED TO ADD: I'm not sure if flights to Ireland previosuly were charged the 'domestic' PSC rate at LHR (would be valid as they are essentially no different to handle to UK domestics due to the common travel area, etc).

However from 1st April the LHR PSC for domestics will go from £13.60 to £23.60 - the same rate as for other European flights. [Which themselves will only get a tiny increase.]