The United Kingdom and Europe

Can I get a visa for another European Union or European Economic Area country from a UK visa office?
No. You should contact an embassy or consulate for the country that you wish to visit. 

Can I use it for the United Kingdom?
No. The UK is not part of the Schengen group of countries and if you need a visa for the UK, you must apply for one at a British visa office before you travel to the UK. 
www.ukvisas.gov.uk

Do they need a visa to visit the UK?
She/he will need an EEA Family Permit issued at a UK visa office overseas before she/he travels. You must either travel to the UK together, or your family must be joining you in the UK. Family permits are issued free of charge. Countries of EU