Sorry about the time delay - I had another go today. The belt can't be on the wrong way as I left it on the crank pulley and simply pulled it back over the power steering pump pulley, so it never changed position.

When you say it's simple enough to bleed do you nean by turning the wheel from lock to lock?. I jacked the wheels up and turned the steering wheel to left and right lock repeatedly for a few minutes then turned the engine off about 15-20 times. A little improvement, but then it overflowed again. I topped up the fluid to a higher level with Honda fluid and some large bubbles came out and then it seemed to be fixed! Came back a few hours later and it was making a noise again. I've driven it around the block a few times but definitely not happy with it yet. I think when I moved the pumped a little to gain access to the alternator (without disconnecting any pipes) I lifted it up to a slightly higher level - would that have made a difference? Also have a look at this video: www.youtube.com/watch?v=Wf-_qp1y4yc it's about changing the o ring on the reservoir side of the pump, It's from a 3.2 litre American Honda and on the other side of the engine, but the connectors look the same on the pump, so it might be the same or very similar to mine. I did order the ring from Honda today, but they ordered the wrong o ring, so will have to re order to try that route.