1. Dash off......only undo the LITLLE screws in front of the dash (or your windscreen wipers will fall off!! ok, the motors will...) Couldn't do it by hand, but the electric screwdriver did the job well. Remove anything mounted on the dash, and the assorted tat that gathers there! Strip the cowling from the instrument panel and remove the instrument panel as well. Remember the fun you had putting the stereo in...well take it out - you get to put it back later! Now the heater control panel and sliders....pull the 3 or four plastic knobs towards you....they come off, honest. Then the switch itself...pull off the bit you turn. Right, with a small screw driver, slowly prise off the cover, bottom left and top right. Slowly slowly here. The three screws (poss 2) to release the slider gubbins from the dash. Got a cigarette lighter....remove the connections. Remove the glove box. Hand underneath at each end, pull off the two air hoses. 2 screws or bolts on the pillar on either side...remove and the dash should now come away. Sorry - missed a bit....the bolts that hold the steering column on. Right - these are special sheer bolts....but we were able to remove and reuse, but you do need decent mole grips, and attack the bolt at the one straight part of the bolt. You don't have to take the steering wheel off....but it did give a little more space to work in.
this is what revealed itself under Ermie's dash

HELP!!!!!!!! Sure there is some genuine original wiring in there somewhere!!
2. Remove the fan heater unit....screws and bolts all over the place. Remove the front grill (yep fixes in from the front too!). IF you have clips around the heater unit, unclip and seperate the box. If not....and we didn't in Ritchie you are going to have real fun working your way around with a small screw driver to get into the thing. PS - you will need some silicone sealant to stick it back together!! Once its unbolted and you are in you get this....

that skinny thing on the bottom right is the resistor that controls the speeds apparently!
3. Oil the bearings. Right in the middle of the picture is the fan. you can see the first bearign you need to oil - its that brown spot in the middle of the fan. A little bit of WD40 followed by a manual spin of the fan will clean any gunk, then a drop or two of engine oil will lubricate that bearing.
Now look round the other side...
You wlll see a plastic drill with letters on it. Now be brave as you are going to drill next to the letters, aiming towards the centre as the other bearing in lurking beneath:

and after drilling (we used a 5mm bit)

Now, with a little screwdriver dipped in engine oil, offer some lubricant onto the bearing....

Give it a good dose....u don't want to be doing this again next year!!!
Spin the fan...drop more oil on both bearings and you are good to go! It should be silent now!!!
Now, put it all back.....oh - just to mention...when we put the dash back, and were at the putting the instruements back, we both found that the speedo cable had gone walkabout....dunno how, but they were both up in the same place....right up under the windscreen....need little fingers to hook it out. May be worth hooking it round something to stop it wandering off!!
Hope this helps someone....there are instructions in the wiki but no pictures!!
Em
xx