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yip sorry i should have explained more flue is running from boiler out side wall now vokera is 130mm from back wall to centre of flue and ideal is 150 from back wall to flue which would be the normal fit

but the existing boiler is a ferroili and its 105 from back wall so not much play to get new flue in existing bore

hope that makes more sense
 
125 round about the same as the vokera at 130 just dont want to hang boiler next min theres not enough play in the core to connect if you get me 15mm sounds nothing but theres usually not much play in flues
 

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