Searching for the manual, finding it AND posting the link here took me less than one minute.
https://www.vauxhall.co.uk/content/dam/Vauxhall/Europe/united_kingdom/nscwebsite/uk/Home/pdf/Owners_Services/owners_manuals/Astra-H%20IM_KTA-2733-2-VX-en%20%28MY14%29%20July%202013.pdf
Wouldn't it have been easier to at least TRY a search for yourself?
XXX, February 2016