Hollow sounding floor tiles.

[grumpygrouter]

I think you are right Jimmy, but we all try to go with the guidlines as far as possible don't we?

 

[RockCeramics]

The standards produced are titled British Standard XXXX[-P]:YYYY where XXXX is the number of the standard, P is the number of the part of the standard (where the standard is split into multiple parts) and YYYY is the year in which the standard came into effect. British Standards currently has over 27,000 active standards. Products are commonly specified as meeting a particular British Standard, and in general this can be done without any certification or independent testing. The standard simply provides a shorthand way of claiming that certain specifications are met, while encouraging manufacturers to adhere to a common method for such a specification.
The Kitemark can be used to indicate certification by BSI, but only where a Kitemark scheme has been set up around a particular standard. It is mainly applicable to safety and quality management standards. There is a common misunderstanding that Kitemarks are necessary to prove compliance with any BS standard, but in general it is neither desirable nor possible that every standard be 'policed' in this way.

 

[RockCeramics]

Found and browsed the site federation of master builders on here you can find and search there base to see wich builders are a member (as you stated you dont really want to name and shame but you might want to check if they are a member here .)
Also a link for any help and advice , theres also a page where you can download free contracts for / domestic contracts upto 50k and so on.
FMB Online - Federation of Master Builders
just use the links on the right.