*POSTNL PLANS TO SELL STAKE OF ABOUT 15% IN TNT EXPRESS
*POSTNL CURRENTLY HOLDS 29.8% OF TNT EXPRESS SHARES
*POSTNL SAYS DEUTSCHE BANK, GOLDMAN SACHS TO ACT AS BOOKRUNNERS
*POSTNL SAYS ACCELERATED BOOKBUILD STARTS IMMEDIATELY
*POSTNL TO USE PROCEEDS TO REDUCE DEBT POSITION