Here are some links to other sites that may be of interest to you:

Concert Bands
Adur Concert Band – Based in Shoreham, West Sussex
Bognor Regis Concert Band – From Bognor, West Sussex
Essex Concert Band – Based in Rowhedge, near Colchester
Littlehampton Concert Band – Community band from Littlehampton
Northbrook Community Concert Band – Based at Northbrook College, Worthing
Phoenix Concert Band – Based in Radlett, Herts.
Second Wind – Concert Band from Sevenoaks, conducted by Martin Forward
Southdowns Concert Band – From Arundel, West Sussex
Wirral Symphonic Wind Band – Based in Moreton on the Wirral.

Other Bands
Ain’t Misbehavin’ – Jazz duo available for hire in East Sussex
Borderline Jazz – Dixie/Swing band – music for all occasions
Swingshift – Jon Bailey’s other band

General Musical Links
Ackerman Music – Sussex music shops
ESCIS – A gold mine of community information for East Sussex
Tim Reynish – Personal pages of the former Head of Wind and Percussion at the Royal Northen College of Music. A great resource for anyone interested in wind bands.
UK Amateur Orchestras – Lists many of the non-professional ensembles in the UK