can I place a basin trap away from the basin or is there a regulation that it must go directly on the bottom of the plug hole. the problem is I need to fit a bin underneath and it wont fit with the trap directly on so can I put an elbow on and position the trap at the rear of the cupboard out of the way. Will this 12" of pipework before the trap cause smells, germs and possibly even MRSA. Please help someone. THANX