If it wasn't the law I wouldn't buy any insurance other than home insurance.
How many times have you bought a computer or some other electrical thing and they ask you if you want a warranty? Basically, insurance in case it breaks.
Look at it this way. The insurance company knows the odds of these things breaking and offers insurance (a warranty) based on those odds + profit. Now extrapolate all the warranties over your lifetime. If you just let the occasional thing break, you'd be out of pocket to the tune of the cost of your warranties minus the profit those companies make. In other words, a warranty is a scam. Its like buying Calgon for your washing machine.
You are supposed to add a tablet every time you do a wash to protect your washing machine.
Calgon tablets are £20.29 for 75 tablets or 27p per wash.
It takes 6-8 years of washing in hard water to get a build up to get the kind of lime scale that will break your machine. In this time if you do 3 washes a week, that's over £300. Getting an technician to replace the parts would cost £50. Or of course for £300 you could buy a new bloody washing machine with all the parts including motors etc with 8 years more life in them.
sourceInsurance never ever pays.
With the exception of house insurance. Not contents insurance. You are being boned on the risk of burglary vs cost of insurance + profit.
I would only buy house insurance because its the one gamble most people cannot afford to take even though of course most never claim and are paying odds + profit. Everything else, never buy insurance unless its the law.
So, do I want to pay environmental insurance just in case? No damn way.