Thanks again Sid I also found similar but steered away from it as camera dint appear to be the same. I've sorted it now with the switch off eBay. Which can also be purchased from RS.
It's an omron switch part no D2HW A201D
Photos attached show the tabs soldered on to allow the original wiring harness plug to connect. Bit fiddly but it works.
Link to switch on RS
https://uk.rs-online.com/web/c/?searchTerm=Omron+D2HW+A201D