On 1 Nov, 19:05, Jim K wrote:

mmm that link appears to merely offer the opportunity to purchase a
copy of the ISO standard for 200 odd swiss francs?

If you do want to read the standard, there is probably no need to pay
for it - just download it as a pdf at your public library. There will
almost certainly be a BS EN version available from the British
Standards Institution website. Most library services have a
subscription which allows the downloading of secured pdf images from
BSI.

John