In article , Peter wrote:
Can anyone suggest where I can get 5cm, thin walled metal or plastic
flue pipe for a Kelston boiler? I want this so I can run it inside the
route of an existing 10cm pipe.

Keston boilers use 50mm muPVC waste pipe available from all good
plumbers merchants. Note that this is not the same as regular uPVC
waste: it's made to stand higher temperatures.

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Tony Bryer SDA UK 'Software to build on' http://www.sda.co.uk
Free SEDBUK boiler database browser http://www.sda.co.uk/qsedbuk.htm
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