My last top-up was rather disappointing and now I know why. I checked my tyre pressures a week ago and they were all fine, but today I thought a rear tyre looked a bit soft. I checked it and it was down to 11 psi. Now recently I have been spraying my tyre valves with leak detector solution, having ruined a tyre because of a leaking valve, but the spray is at my garage in Kirkcaldy and I checked the tyres in my drive at Danderhall (I wanted to check out my birthday present, a cordless compressor). Checked the valve today and it was fine, so I will check on the pressure to make sure I don't have a slow puncture elsewhere (I didn't see anything).