Getting the nozzle off was easy, but this remaining fitting I assumed I could use the multigrips and rotate anti-clockwise, but it appears to be very tight and I don't want to do any damage to the plumbing.
If it helps to know, the fittings are about 13 years old, located in Perth, Western Australia.
Once taps and nozzle fittings are removed, do I just terminate the water supply with these threaded hex plugs? https://www.bunnings.com.au/brasshards-15mm-brass-threaded-hex-plug_p0262231