Hi Diddlydo,
Thanks for your enquiry (I have also replied to your email a few moments ago). Although this Yamaha receiver doesn't have pre-out sockets, it can still be used with Beolab speakers, but additional converters are needed.
Please don't use the cables in the second link that you suggested, as these are for Beogram record players, they are not for use with speakers.
Changing to a receiver with pre-out sockets (as Hiort suggested) will require the same cables, but you won't need the converters mentioned below. Here are the items required to use your speakers with this receiver:-
For each pair of Beolab 8000 speakers, please connect two speakers to the red and black speaker terminals on the back of the receiver using this Attenuated Converter: link and then use this cable to connect the speakers to the output sockets of the Converter: link
Please set both speakers to “Line” mode using the small switch near the input sockets.
The Beolab 2 subwoofer needs a special powered cable to generate the trigger signals that would normally be sent from a B&O television:-