Various
The ultimate manhole covers site
Certification mark for quality of the British Standards Institute (BSI Group) used mainly for products whose safety is as important as helmets, smoke detectors and of course covers.

Kitemark page at the The British Standards Institution (BSI Group) web site https://www.bsigroup.com/en-GB/kitemark/

An example of a cover that carries the standard on the "ultimate manhole covers" site. From this lid the picture that appears in the general section was taken.
There are 491 manhole covers in the site that has this standard mark
Click for all the covers with this standard

Click for the rest of the standards in the site

The ultimate manhole covers site

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