THE "Big Six" energy companies are among the worst offenders when it comes to poor customer service, with npower finishing bottom in a poll of the UK's biggest brands.

The annual Which? survey found all of the big six - British Gas, EDF Energy,E.On, npower, ­ScottishPower and SSE - languishing in the bottom fifth of the table, with none scoring more than two stars for making customers feel valued.

The poll of more than 3,500 consumers gave npower a customer score of 57 per cent, replacing last year's lowest scoring company Ryanair at the bottom of the table. Second from the bottom is ScottishPower, with a rating of 58 per cent, down from joint 62nd in last year's rankings.

SSE managed a customer score of 64 per cent, giving it joint 94th position with BT and EE, while E.On and British Gas achieved 67 per cent and EDF scored 68 per cent.

Internet and telephone bank First Direct topped the table with a score of 87 per cent, achieving the full five stars for making customers feel valued and resolving complaints.

Others in the top five are Lush (86 per cent), John Lewis (83 per cent), Lakeland (83 per cent) and Waitrose (83 per cent).

However banks such as Santander and NatWest were in joint 70th position on 70 per cent, and Royal Bank of Scotland, HSBC and Barclays/Barclaycard all finished joint 60th with a score of 71 per cent.

Which? executive director Richard Lloyd said: "This survey should be a wake-up call for the companies with the lowest customer scores."