Apart from these Indians In London Groups and Communities on Social networking websites like Orkut and Facebook, there are some other dedicated sites for special purposes like
http://www.indiansinuk.net - A Homepage for All Indians In UK, Indians In London, Events
http://www.indiansinuk.net is Web's Most Popular Portal for All Indians In London and UK, Online Communities, Indian Groups, Forums, Indian Events, Indian Matrimonial, Flatshare, Indian Flatsmates, Professionals, Jobs, Indian News & Blogs, Make New Friends, Friendlists, Restaurants Reviews, ALL FREE, Anything Indian In London or UK find it here. Join us and make it stronger!
http://www.indianprofessionalsinuk.com - A site totally dedicated to provide a platform for introduction for friendship, dating, matrimonials for Indian Professionals In UK. And at the time of writing this, the site was offering free Gold membership which allows members to send mails to each other and chat live with each other. The site features Live chat, Voice Chat and Even Web cam chat. Here is an excerpt from site's "about" section - "there was no dedicated platform where Young Indian Professionals could get in touch with each other, become friends and may be more. All other dating and matrimonial websites either target to the broad Asian audience or aren't focussed only on UK/London. It is much more charming to find an Indian Professional person from same cultural background locally in UK who can be your good friend or possibly life partner. A decent level of interaction before the big decision can ensure that a harmonious and doubt-free environment exists in the form of a comfort zone where one finds it easy to commit to someone for life."

http://www.indianstudentsinuk.com - A site dedicated for the benefit of Indian Students In UK. The site serves many urgent needs of Indian Students aspiring for UK Education.
1) To form UK college/uni related communities and join them and discuss common issues. Add friends and keep in touch with classmates and batchmates.
2) To be able to rate and review crap and good colleges so as to protect future students from wasting their parents' heard earned money on crap/fraud/dodgy colleges.
3) To be able to search for JOBS posted by Indian Ethnicity Friendly Employers in London, Birmingham, Manchester, Glasgow and all over UK. This will act as a much needed bridge between the employers and small scale businesses like accountancies, law firms etc who want to offer internships and apprenticeships to students but can't reach them diretly on any portal. And students will have better options to gain useful professional experience compared to no-good Burger/Pizza, Cash n Carry and Tele-marketing jobs.
4) The site will also allow people to post Flat Share - Room Share kinda adverts in Classifieds section so making it very easy to find like minded flat mates to live with. It will help a lot to needy students to find cheap student accomodation all over UK.

http://www.bollywoodinlondon.com - A site dedicated to provide news and information about Bollywood In London and UK, Indian Clubbing London, 21 Online Indian Radios, Asian Clubs london, Bollywood dance schools, Bollwood Acting schools, Bollywood Premiers London, Bollywood Movies Reviews, Bollywood fans Meetups. It provides a platform for people in Media, fashion, Cinema and Art to connect with each other through groups, forums and blogs.
http://www.bengalisinuk.net - A site dedicated to provide news and information about Bengali Culture In London and UK, Durga Puja Venues all over UK and various other features. It provides a platform for Bengalis to connect with each other through groups, forums and blogs. Organise events and meetups and social occasions.