Does anyone have a service manual for the Baumatic bfd46w or Beko dishwasher or could anyone tell me where the 'Rinse 70 degree' thermostat is located?

I googled your problem and found these are sold in the UK. You can actually Google this for your own info at google.com and entering BECO DISHWASHER.

Other than going on line and calling up the service manual here, you can do it too :)