Per Transfer Market, Martin's contract runs until June 2024. So there's one year of compensation we're due.
Also, at MK Dons for 80 matches, his record was 1.38 points per match. With us for 99 matches, his record is 1.35 points per match. Not stellar for either club. Looks like he's a mid-table table manager regardless of division. Soton are taking themselves out of the mix for promotion next season.
Note, there's always some overlap between the bottom of the Prem and the top of the Championship. Soton are crap. Where, I wonder, will they finish in the Championship.