Here's the Link to see what your helmet is rated at:
https://sharp.direct.gov.uk/home
another Link
https://www.webbikeworld.com/motorcycle-helmets/sharp-helmet-rating-system.htm#flipup
https://sharp.direct.gov.uk/home
another Link
https://www.webbikeworld.com/motorcycle-helmets/sharp-helmet-rating-system.htm#flipup