All the following may be true if the electrics have not been butchered by previous owners:
The three behind the fuse board should be the headlamp relay (usually the red one), the starter relay and the brake fault thingy one, there should only be one behind the instrument binnacle, that would be the heated rear window.
The other ones behing the binnacle would be the volt sensetive thing for the heated rear window (so the HRW does not drain the battery on zero ignition) and perhaps a dim dip black thing?
- any help??