Hi Olly. Sorry to hear you are having problems.
I have a spare main relay kicking about somewhere (fits my 2001 NA2, not sure if these are year specific?) You're more than welcome to borrow it and swap yours out. (I'm away for the weekend but back early next week). Just shout.
2001 3.2 Circuit Blue Coupe with pop-ups!
"If you want to argue that The Best Car in the World is a supercar, go ahead. But there is only one that makes the grade. Only one that's built properly.
Gordon Murray knows.
Rowan Atkinson knows.
It's the Honda NSX."
(J. Clarkson)