Now that we have two kids, I'm going to gracefully retire from reproduction and get it done!
I chatted it through with my GP a couple of weeks ago. It's a simple procedure, but apparently I need to attend a counselling session first. That's booked for mid June.
But what surprised me is that once you've had it done, it can be 5 or 6 months before you're properly sterile. I assumed it was instant.