Here are some links that you may find useful:

Johndilworthviolins.co.uk - A regular contributor to both our website and to 'The Strad' Magazine. 

Cozio.com - comprehensive information about antique Italian stringed instruments.

Invaluable.com - Art Market Intelligence at Your Fingertips.

Amati Books - Dedicated to String Instruments.

Spink.com - Dealers and Auctioneers in Coins, Medals, Stamps, Banknotes & Books since 1666.

Justjazzguitar.com - Just Jazz Guitar Online.

Thestrad.com - The Strad: Voice of the string music world since 1890. 

Allthingsstrings.com - The official website of Strings. 

Dilettantemusic.com - A new website for musicians and collectors.

Maestronet.com - A website for dealers, musicians and collectors. 

Allinlondon.com - Our listing in the London online Newspaper