Manufacturer's warranty may apply to new boilers. However, this doesn't entitle you to hire a technician to fix minor errors. To ensure that you can fix any issues, it's a good idea to have an insurance policy that will cover you if your boiler breaks.
There are several companies that have online listings for new and old boiler replacements. You can visit https://yourheat.co.uk/care-plan-pricing/ to know about the insurance coverage details.
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Many insurance companies do not offer boilers that are more than ten or fifteen years old. You may need to contact a registered gas technician to inspect the boiler and determine its age and see if you can find an insurance company that is willing to cover it. If not, it may be worth researching how much it will cost to upgrade to a new condensing boiler.
The heating system obviously takes a load in the winter months and is, therefore, more prone to breakage. Therefore, it is very important to have something in place for such a scenario, especially if you have a young family.
The simplest boiler cover gives the right to call the technician only if the boiler controls or functions are damaged while providing the most complete view that you have covered the entire heating system and in some cases the piping system.