Thanks for the quick reply I wasn't sure about the home test because they alternate between definitely 'not there' and EXTREMELY faint, also I'm only using a THC dipstick, not a multi-panel (I'll get some to try). The medical is just to clear me for work, I understand that it would conceal any problems but I'd prefer to clear this and then have a personal medical later (I wouldn't be having one if it wasn't for this job), I don't mean that to sound irresponsible but getting this job REALLY is a priority. Would the synthetic stand up to the tests (i.e. give the results as a normal sample without any 'giveaway' signs that I subbed)?

Again thanks for the reply, knowledgeable guys are hard to find in the UK!