I had an ambo flight from Shetland to ABZ one day, with Inverness as my alternate. Unfortunately Inverness started deteriorating close to mins (not in the forecast) while I was trying to get into ABZ, and the rate was rather faster than I could get to INV, so off to Dundee when a couple of partial tries at ABZ didn't work (kept dropping below mins before I passed 1000'). Company was a bit miffed that I didn't go to INV, but damned if I wanted to be running out of fuel over an airport that was below mins. As far as I was concerned the reducing wx wasn't in the forecast so no way was I going to trust that it *might* stay above mins while I droned my way there. It ended up going below so I've never been happier about one of my decisions.