Fareham Philharmonic Choir

Amazon - online retailers of books and music, with a good Classical section.
Naxos - online retailers devoted entirely to classical music.

Classical Music UK - information and articles about classical music.
Classical Search - the Classical Music Search Engine.
Impulse Music - Pages on contemporary classical composers and performers.
Classical Sheet Music - 200+ free pieces of sheet music, and paid access to more. Also features downloadable music (midi) files of many works.
Gramophone - "the world's best classical music magazine".
Classic FM
Classical Net - has pages on individual composers.

Bach:
Bach Central Station
Bach Digital
JS Bach (biography)

Brahms:
Johannes Brahms (biography)
Island of Freedom: Brahms
Brahms - A Collective

Britten:
A Benjamin Britten reseach project
Benjamin Britten: Biographical Outline
The Britten-Pears Foundation

Elgar:
Bavarian Highlands voice parts

Mozart:
The Mozart Project
Wolfgang Amadeus Mozart (biography)
A Mozart Tribute
Mozart's Place

Verdi:
Verdiana! Giuseppe Verdi

Vivaldi:
The Vivaldi Homepage
Antonio Vivaldi

Botley Choral Society
Milton Glee Club
Portsmouth Choral Union
Portsmouth Festival Choir
Romsey Choral Society
Southampton Choral Society
Southampton Philharmonic Society

Google UK - a very good search engine.
Yahoo UK - provides email addresses, webspace, search engine, shopping etc.
ICUK Hosting - is providing the space for this site at a very reasonable rate.