The early Beovision/Beocenter 1's that came with the Beo1 remote - Are these compatible with a Beo4, or is it just the later updated versions that are compatible?

Ian 

They all use the same codes so a Beo4 will work - quite a bit better than a Beo1!!

There is also a setting in the service menu that you can change for Beo1/Beo4.  I think that this is because operation with Beo4 is slightly different as you can select sources directly without the need to scroll up and down in the display on the tv and secondary functions come from the LIST on the Beo4. 

I use a Beo4 but my BeoVision 1, the sevice menu shows the remote as a Beo1

I have Beo1 and Beo4 with my BC1 and I prefer Beo4, it´s more useful and easier to control the tv and other B&O products.