I can definitely see the attraction of a bathroom with a double sink - we have a downstairs shower and loo but there's only one bathroom upstairs which we all use in the morning. Two sinks would be great, but we are managing OK with one.
All the double-sink units I can find seem to be a minimum of 1200mm - more typically at least 1450mm - but the space the sink has to go in can't really be any wider than 1000mm - possibly 1100mm at a squeeze but anyone standing at the left hand sink would be hit on the elbow by the opening door so not ideal.
Should I try to squeeze in two sinks regardless of cramped elbow-room - which I could achieve by buying two undermount sinks each about 45cm wide and making my own "custom" unit - or should I just admit the bathroom is too small for two sinks and just have the one?