Wikipedia doesn't say it - and I can't be arsed to go plumbing t'interweb now - but I'm pretty sure he was with us as a youngster, went to Lewes, and then came back in 2011.
Would this be the point where I remind people of the suggestion that they listen to the David Burke interview on The Albion Roar?
http://www.albionroar.co.uk/archive.php
Nope. Solly March's time at Brighton pre-dates David Burke.