Wow, £120/year to insure a relatively low cost replaceable item!
If it is a half decent reliable brand, stick it in your savings account and buy another when needed. Not much goes wrong with dishwashers anyway.
Our £350 Bosch is still going strong after 14 year without repair. Before that we had an AEG for 7 years, and gave it away to my wife’s brother. It’s still going strong after a total of 22 years
Only insure stuff you can’t afford to replace. Otherwise you are lining the pockets of the insurance companies.