The stated reason is the same as Nick’s: since the FTX collapse he’s been reused from too much board business for staying on the board to make sense:
Since last November, I’ve been recused from the board on all matters associated with FTX and related topics, which has ended up being a large proportion of board business. (This is because the recusal affected not just decisions that were directly related to the collapse of FTX, but also many other decisions for which the way EV UK has been affected by the collapse of FTX was important context.) I know I initially said that I’d wait for there to be more capacity, but trustee recruitment has moved more slowly than I’d anticipated, and with the ongoing recusal I didn’t expect to add much capacity for the foreseeable future, so it felt like a natural time to step down.
The stated reason is the same as Nick’s: since the FTX collapse he’s been reused from too much board business for staying on the board to make sense: