So I did a little bit of tinkering yesterday and adjusted the position of the windscreen wiper crank - it was annoying me that the wipers actually came back up about an inch before stopping and it was clear that the wiper motor has been out before and wasn't adjusted properly... In the process I found the missing nut for the the top of the LHM tank stuck inside the windscreen wiper cavity...pity I didn't find it before I stole the nut off the old car...
I checked on the leaking hydraulic pump and the top pipe o-ring is leaking quite a bit more now.

Enough that the alternator has a thin coating of oil all over the front of it. I checked the LHM level and it required a small top up so there is definitely a significant leak and there aren't any other leaks visible on or under the car to explain the drop in level.
I suspect the dud accumulator sphere is putting a lot of strain on the o-ring by causing very high pressure spikes every time the regulator cuts in and out - the clicking is very rapid indeed, so it will be a relief to get the new accumulator sphere fitted - with luck on Friday if they are delivered by then.
Hopefully with the new accumulator sphere fitted the o-ring can last until late October - by then we will be moved into our new house and I will be able to work on the pump at my leisure in a garage out of the weather!

I might as well take the pump out and do the job properly, replacing the iffy looking aux belt at the same time and cleaning the alternator.
Does anyone know off hand what size and depth ring spanner is needed to get the "difficult" mounting bolt for the pump out ? When we had the pump out of the old car Richard fortuitously had just the right deep reach ring spanner for the job without which it would have been impossible - I know for a fact I don't have a suitable spanner so will have to buy one to be able to do the job by myself, if I only I knew what size it was.
The buzzy bee noise when accelerating is definitely the exhaust hole in the pipe in front of the rear muffler and its getting worse. I'm thinking about putting a halfords wrap around patch around it to keep it quiet until we get a chance to look at repairing it properly.
I popped the cover off the fuse box for the first time and noticed a few things "missing".

On the left hand side there is a blue relay missing and a maxi fuse missing in the middle at the bottom, anyone know what these are for ?
On the main fuse box on the right hand side fuse F4 is missing:
Unfortunately I didn't get an owners manual with the car, nor do I have Series 1 wiring diagrams so I have no idea what the missing fuses and relay are for...(does anyone have a 1997 S1 owners manual that covers the V6 that they want to sell ? Or for that matter electronic copies of S1 wiring diagrams ?)