We have paid for D&G boiler cover for several years, £21 a month. It includes a free annual boiler service.
www.domesticandgeneral.com/heating
The last service was on 11 Feb 2023.
Just rung up to book this year's service, and been told "you can't open a request for a service until 12 Feb 2024, your last service is too recent".
Note this wasn't D&G actually booking it in for 12 Feb! Instead we have to phone back then and then they will phone the firm they outsource it to. So probably no actual service till March.
AIBU to think an annual service you pay for should be... annual?