If you are coming from the North VFR, expect to join via Stoney Cross VRP not above 2000ft QNH. (Beware of the Solent CTA and Boscombe Down MATZ on the way. Chilbolton radio telescope makes a good feature to aim for to keep you clear of both). Further routing will depend upon the runway in use.
I believe Bournemouth Handling (near the Jet Heritage Hangar) offer the best option for small aircraft. Or you could try Signature if you want the full FBO-Type operation and cost.