I have now ordered an emergency stop button and a power on / off switch. These are on a slow boat from China and should be here at the end of the month.
EDIT:
I was expecting some instructions when receiving these items but there were none. Using the amp meter I found that the emergency stop switch was of the NO/NC type(one side breaks the connection whilst the other side creates a connection). Wiring to the side that breaks the connection is obvious and here is a great link to someone who has made a emergency stop unit that I will base the wiring off.
https://www.instructables.com/id/Emergency-Stop-Button/
The on/off switch is an in-line switch which has a live, neutral and a earth connection which will be placed inline after the emergency stop button.
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