Chimney liner - size

1 May 2014
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United Kingdom
We are due to build a new chimney on our new extenision in the next month. We will be buying the Isokern Pumice flue liner (not the DM system) but I am wondering what size to buy.

We will be having a stove with a 150mm flue but there doesn't seem to be any guidance on the flue liner diameter should be. I've read online that someone used 200+mm to attach to their flue pipe with an adaptor.

Just looking for some guidance on size and if there's any calculations i should be checking, or do i just pick any size over 150mm?
The chimney will be block built around the outside with Leca backfill.

MAny thanks for any help.
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