I would like to think i am being responsable by trying to establish some parameters. I don't drink to get drunk, I would be paranoid about embarrising myself. We live in a rural area, 3 miles from the nearest pub, but we have good friends and neighbours nearby, and would typicaly have dinner in ours or their houses at the weekend, with wine. If you are having a good chat, and someone is topping up your glass, you can't be sure what your unit intake is. I am fortunate that I can work at home and be flexable about driving times.
Again, If I had a device that said I was near 0 at 7 am, I would be happy to wait till 9am to be sure.