This washing machine from Hoover has a great energy efficiency rating (A++). It has a width of 60 cm and it comes with a noise level of 76 dB.
From Amazon
HBDOS695TAMCET80 Built-In 9+5kg 1600rpm Washer Dryer
Hughes
HBDOS695TAMCET80 Built-In 9+5kg 1600rpm Washer Dryer