Hi.
I used to work for a practice who were BDA good practice scheme accredited.
We had our urine tested every year to monitor the mercury levels.
I can't remember the name of company we used, but they would send kits with a sample bottle and a personal questionnaire for each member of staff. We would then arrange a "wee day" and post the tests back.
Each member would then got a printout of their reading.
hope this help.
Good luck with your application. The hard work will be worth it!!
karen.