Managed to flatten the battery - I think I left the interior lights on for a day or two - will investigate further this week. I'll pop into my local Honda dealer to see the price of a new battery and the plastic-coated retaining bar, which looks a little tired. While I'm there I'll order a couple of bits that seem to be missing - a seat foot cover and one of the spare wheel cushions. I have looked for a c-tek battery charger / conditioner, but they seem very expensive here compared to the price in the UK.....