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Really I don't think that gap is anything to worry about,on servicing make sure the techs change the nozzle,if you aren't sure of size of nozzle post it on here and I'll check my books and tell you,need make of boiler and size in btus or kw,also make sure they take out and clean the baffles also when the analyser has been used check the O2 it should not be above 4.5%-5.5% if it is then they are putting too much air in to keep it clean, you should always have a little bit of soot.
By the way heating world of spares no is 01388 760333 Bob.
Why change a nozzle unless combustion is off !!
AS for........... you should always have a little bit of soot. I set all my burners to 0 Bacharrac !!
An insulating layer of soot on the heat exchanger negates any small co2 increase gained!!!