http://www.ukba.homeoffice.gov.uk/visas-immigration/while-in-uk/extending-stay/ If you currently have temporary permission to stay in the UK, you may be able to extend this permission and stay here longer. If you came here as a visitor, you cannot extend your permission to stay as a visitor beyond 6 months in most cases - however, in some circumstances you may be able to switch into a different immigration category.
http://www.ukba.homeoffice.gov.uk/visas-immigration/while-in-uk/extending-stay/
If you currently have temporary permission to stay in the UK, you may be able to extend this permission and stay here longer. If you came here as a visitor, you cannot extend your permission to stay as a visitor beyond 6 months in most cases - however, in some circumstances you may be able to switch into a different immigration category.
www.ukba.homeoffice.gov.uk could be a website you may feel useful