i think you are looking for the old standard
Helmet Standards
All road legal motorcycle helmets sold in the UK must conform to British Standard 6658 and will be either categorised as Type A (blue label) or Type B (green label). These stickers are normally located on the back of the helmet and will also include a batch identity number. If it doesn't have a sticker, don't buy it, it may be an import and will not be legal on British roads. A recent article suggested that most Traffic Police were not interested in the safety stamp, providing the helmet was a recognisable brand and model. However, this may change in the future.
The BSI 6658 standard is one of the toughest tests for motorcycle helmets in the world. It is generally accepted to be better than the American DOT and European CE standards. The standard doesn't just test new helmet designs, but mandates testing of a %age of all batches manufactured. All this helps to reduce the risk to you in the event of an accident. Recently the European Union have addressed this by creating EC 2205 which is accepted as an equivalent to BSI 6658.
A Type B (green) label - ensures that the helmet meets the minimum criteria for a road legal helmet and has been tested for general riding use.
A Type A (blue) label - helmet exceeds this criteria and has been tested to withstand maximum impact (including a chin bar tests, etc.). The Type A test is aimed at helmets which may be used for racing.
In addition to your Blue or Green BSI sticker, your helmet may also have an Auto-Cycling Union (ACU) gold or silver badge. The ACU is the governing body of motorcycle sport throughout the British Isles, excluding Ireland. ACU accreditation is different from the BSI standards, however they typically match the standard, with ACU gold going to most Type A helmets and Silver to Type Bs. The price of a type B will range between about £40 and £100, while a Type A will range around £70 to £400. Always try to go for a type A/gold if you can afford it, as it will give better protection and should last you longer. You will also be allowed to use it on a track day if you wish.
While it is not a legal requirement to have a visor, if one is fitted it must comply with the BS 4110 ZA or YA test standards. These standards define impact and scratch resistance as well as tint. Blacked out visors are not road legal as is any visor not marked with the BS stamp.
http://www.prestondmc.co.uk/SectionC2004.pdf
lods of lids out there