we have a Worcester Bosch GREENSTAR CDi CLASSIC combi boiler, fitted 8
years ago (in the garage).

Used for heating and to power one very frequently used shower.

It has been serviced annually (£75 I think) as it was a condition for
the 7 year warranty that it came with. It worked without any fault
since new.

Is it a good idea/necessity to have it serviced every year?

Not having an issue with paying for it - just wondering if it is
necessary? I most definitely want to make sure that it stays safe to use.

What does the panel think please?