This model from Beko has a great energy efficiency rating (A++). The washing machine has a width of 60 cm and it's a freestanding model, so it's easy to move.
From Appliance Centre
Beko B5W58410AW 60cm White 8kg 1400 Spin Washing Machine
Atlantic Electrics
Beko B5W58410AW 8kg 1400 Spin Washing Machine - White