*Euro edges slightly higher against most majors as ECB slashes key rate to 1.5%; now worth 1.2567 against dollar

*ECB cuts key interest rate by 50 bps to 1.5%

BoE Cuts Interest Rate To Historic Low; Announces GBP 75 Bln Asset Purchase Plan

Euro mostly weaker ahead of ECB rate announcement

*BoE: At its future meetings, MPC will monitor the effectiveness of this purchase programme in boosting the supply of money and credit