I really think we're drifting off topic here, but since Tiger Cub cares to make an issue of it, I'll give the full details, and you can judge as you see fit.
I'd planned a midday flight about 70nm to lunch. Forecast was early mist, clearing about 1030-1100 becoming 10km visibility and 8/8 at 2,500ft - nil Wx forecast. That forecast was on the TAFS for 4 airfields within 10 miles either side of track, wind was about 10 knots.
I got the aeroplane out at 1000, by 1100 the cloudbase was about 1500ft, and visibility cleared to around 6km. I got airborne, sat in the overhead for 2 minutes surveying the Wx and decided that it was pretty much as forecast bar a slightly lower cloudbase.
10nm on track, the cloudbase started dropping, it became apparent that this was not a localised problem, so I turned back to my departure point - cloudbase was a dodgy but legal 600-700ft at this point. Unfortunately the cloud had dropped onto the ground behind me.
Re-planning, I ded-reconned to a motorway (successfully) and turned towards my No.1 diversion, which was about 7nm from me. Halfway there, the cloud decided to start dropping and drizzle started. I decided that I wasn't going to make my diversion, and set myself up downwind for a ridge parallel with the motorway. Cloudbase was about 400ft, Viz was down to about 3km.
At the end of downwind, the cloud dropped onto the ridge, and the drizzle worsened, giving me a 1500m viz. So, I picked the only flat field still available to me, did a 250ft circuit and landed in it.
After I'd calmed down, I borrowed my passenger's mobile and phoned the police, and my destination. Then hitched a lift home to get a trailer.
Damage - £5 to replace a bolt I dropped in the mud whilst derigging, and a box of Chocolates to the farmers wife who gave me a lift home. Landing roll, 70m - I regularly practice both forced landings and short spot-landings, I now know why!
G