My CF recent (and other) experience has, thankfully, nothing to do with family or friends but with builders. We have a property abroad and had to get an area of 150 m2 paved. Measured, agreed a price - fairly relaxed on timetable. Three weeks later they finished, so I went there with my mum to check on the work and pay. Even at first sight I could tell the area done was smaller than agreed. Phone my husband to explain in detail how to measure (not straight forward square, etc) and it came to 110 m2. Long story short, even with their measurements, the couldn't make it more than 125 m2. By then, I was getting so fed up, so sat down and said "ok, we agreed a x price for 150 m2, you delivered less, so I'm working out the price per square meter and paying for the (good, to be fair) job you've done so far. Builder and his son weren't happy and became quite "insistent" to a point my 70 yes old mum got very upset. So I threatened with police, and the guys switch tactics, saying the father has just leased a new 4x4 for the son, relying on the money from this job!?! I said, not my problem, gave them the cash I worked out we owed and went into the house. They must've stayed for near another hour standing around, measuring 10 times over. In the end, they left and I never heard from them again. Still fuming when I think if what CF they were!