cheers all - AK has done all the above, and also lobbed some switch cleaner in it too.
Changed fuse again for 3amp and this gets the standby lamp on, but as soon as you try to turn it on the light flashes a couple of times and then it goes dead
Cant afford to replace this right now........ rebuilding the race bike is more important
If anyone has an amp that we can cobble our speakers into for the moment, (we can run the old dvd player - argos 6 years ago for £40), do let us know