I've just had a call from NPower (my supplier) offering a check on our energy efficiency. Turns out we're about as efficient as we can be! 
One of the things he asked about though, was when was our boiler last serviced. I only bought the place in January, so haven't done one yet. I was thinking I should sometime in the new year? How often should it be done? How much should it cost? Should I have one of those insurance/call out boiler people? Or should I just find someone in the yellow pages? It's only about 4 years old so it's not ancient....
Grrr - I'm so bad at all this DIY/house owning stuff! 