Okay so continuing my search for the offending whistling item at the front of the engine, I changed the fan belt. It was fairly oily so I cleaned all the pulleys before putting the new one on and tensioned it up so there was about 3/4" of bounce if pushed at the half way point between the alternator and water pump. I will check this again after a few more miles to see if it needs re-tensioning. It seems to have made an improvement but I don't know if this has solved the problem completely as it usually is more audible after a decent drive.
I had the car up on axle stands so I could top up the diff oil as I hadn't checked this since I'd had the car either. Well, I have given up for the time being as I couldn't budge it. I haven't got a square head spanner so used a standard open spanner & mole grips with a load of WD40 and a few hours wait. Still no joy, so I'm thinking maybe applying some heat to it or getting a square head spanner or both and getting another filler plug as this one is probably going to look pretty bad if I do manage to get it off. It's not critical at the moment as the diff isn't whining or anything but I would like to sort it for peace of mind that I'm not killing my diff. Last resort I could get a garage to do it for me.
Next is to check the gearbox oil so we'll see how that goes.
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