visa4uk
Visa4UK website guides you through the online application process

www.homeoffice.gov.uk
The Home Office is the lead government department for immigration and passports, drugs policy, counter-terrorism, police, and science and research.

www.ukvisas.gov.uk
complete information regarding visas like study, travel, visitng and working visas, immigration information

www.workpermit.com
Workpermit.com guide to UK immigration, UK work permits, HSMP (Highly Skilled Migrant Programme) and UK work visa Services.