As a follow-up, I called the local Honda dealer to get an idea how much it would cost to replace the main relay switch... they told me 57UKP for the part, but 2.5 hours labour would bring it up to nearly 300UKP (> $500 US). I'd got the impression that it was a pretty simple job to access the relay, and wasn't expecting to pay nearly this much. Is the guy just lying to me?