Bit of a stretch for a "pair", Mark, but this is one I put in a quiz once.............
1 What was introduced in 1969, that resulted in a dramatic decline in the UK suicide rate.
2 What was introduced in 1993 that also reduced the rate considerably.
Just for fun, perhaps you'd like to think about them before I give you the answaers.
12:37 Sat 14th Jul 2012