In London and brought my car from OZ

[Bean]

Pull off the two turn dials, underneath each there's a plastic nut holding it in place. Looking from below you'll see screws (two or three) going into the dash top, remove them. At this point make sure your steering wheel is in the lowest position (lever on the bottom) and lift the cover slightly. Now you should have just enough room to disconnect the plugs of the switches next to the steering column. Now you can remove the cover (The vents will come off too, if I remember correctly). This will reveal five screws holding the cluster in place. Remove them and pull it out a little so you can disconnect the two plugs. Pull a bit further and remove the speedo cable. Outing the new one is just the revers of above.
Hope this helps and greetings from 430m below sea level