As a general rule, I steer completely clear of any and all extended warranties.
Why? Because you only have to look at the enthusiasm with which companies try to sell them. They are enthusiastic because they know they can make flippin' ginormous profits on them, usually by charging exorbitant premiums which prey on people's fears, and by being as slippery as a greased pig when it comes to payng out on any claims.
Much better in my view to start an 'emergency repairs' fund and stick a few quid every month into it.
1986 4/4 VVTi Sport, 2002 LR Defender, 1957 R4 CV, 2005 Ferrari Vipar