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Oh dear - differing points of view. On another forum that I posted this question I was sent a link from a slow cooker web page saying
"Whole poultry is great for pot roasting in a slow cooker. Small birds can easily fit in an average size appliance and be easily prepared with minimal preparation. Preparing whole birds this way leads to tender, moist results and a delicious healthy meal. In general, a one to two pound bird will serve two to three people. It is important to note, though, that whole duck should not be prepared in a slow cooker. Even though a small duck may fit in the pot, the bird will not cook well due to its shape and fat content. Instead, use the slow cooker for smaller cuts, like duck breast. Similarly, geese are rather large, fatty birds and are best prepared in an oven instead of a slow cooker"
But unfortuantely one of the birds is a duck - so will have to re-think
Thanks chaps - one and all