Interior door button

[s6boy]

My driver's door button is beginning to be temperamental and sometimes doesn't work. This is more annoying than anything else but apparently it's a TVR unique PCB and so difficult to source. While it can be sent off for repair I'd rather have a replacement to swap out straightaway but it's not available from Motoclan or Race Proved.
I can't remember reading on here of anything door related but hoping someone may have a suggestion or spare switch.