On Wed, 19 Sep 2007 09:00:35 -0700,
wrote:

How often should a (i) gas fire and (ii) gas boiler be serviced?

Also one hears so much about dodgy engineers etc is there any way of
finding a reputable service co. rather than just sticking a pin in the
telephone directory?

afaiu once a year is the norm .I'd think just before winter sets in
would be the best time .