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Yeah - its not ideal. I initially took it all apart as the washing machine was filling the sink. Turns out someone tipped the contents of the toaster down the sink causing a block in the section before the trap and the washer emptied quicker than it could drain.
I guess thats why previous fitter had that weird elbow with overflow connected to it as they had used up the sink overflow point for the washer.
apc
I think that connection is usually for a sink overflow. Should work but I guess it will be a little bit noisier than the usual place on the p trap.