Prior to joining Ocean Colour Scene, Sealey was singer and rhythm guitarist in Late, a four-piece indie/rock band from Astwood Bank, Redditch, Worcestershire who were active between 1997 and 2001.
The band members were: In 2001, Late supported Ocean Colour Scene at a number of UK gigs in a slot which had previously been filled by Coldplay.
Demo copies do exist though, with the following tracks included "Man In The Middle" was re-recorded by Ocean Colour Scene for inclusion on the On the Leyline album.
Sealey became involved with Birmingham band Ocean Colour Scene after the departure of original bass player and founder member Damon Minchella in late 2003.
Sealey has written songs for both Merrymouth albums, including Last Train But One, In The Midst Of Summertime, Mr Marshall, Blink Of An Eye and That Man.